Seismic Imaging of a Bimaterial Interface Along the Hayward Fault, CA, with Fault Zone Head Waves and Direct P Arrivals A. (Public domain.). Log in Ask Question. to the Hayward Fault, California by Haijiang Zhang and Clifford H. Thurber Abstract We have developed a double-difference (DD) seismic tomography method that makes use of both absolute and relative arrival times. It is a right-lateral strike-slip fault, meaning that motion along it is mainly horizontal, so that objects on the opposite side of the fault from the viewer will move to the viewer’s right as slip occurs. In addition to creating scenarios, regular practice drills by whole communities are essential. After the 1868 quake, and a previous one in 1865, damaged San Francisco, engineers worked to strengthen buildings throughout the Bay Area. The 1868 Hayward Fault earthquake is a reminder of the tremendous power that lurks beneath the Earth’s surface in the San Francisco Bay region. Pool Pumps Pool Heaters Pool Cleaners Pool Sanitization Pool Automation ... Hayward websites have been developed in compliance with standards for Internet Explorer 10 or later. Objectives General: Describe the Hayward Fault at the central park using the technology tools Google Earth applying the got knowledge throughout the field methods course to the characterization of the different geological features in the field trips. This is a type of shearing force where the right block moves toward you and the left block moves away. On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay region. Innovations included a stronger course of brick-laying, incorporating iron binders into brick walls, and interior iron framing. Critical regional gas and water pipelines and electrical transmission lines cross the fault. The Hayward fault is a 90 kilometer long crack in the Earth's crust that travels through the San Francisco Bay area. By reducing sys- tematic errors using the more accurate relative arrival times, the method produces an improved velocity model. English. The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes.This fault is about 74 mi (119 km) long, situated mainly along the western base of the hills on the east side of San Francisco Bay.It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. The 1868 earthquake on the Hayward Fault capped a decade-long sequence of seven increasingly strong quakes in the Bay Area. (Public domain. Earthquake. The Hayward fault is part of the wide plate boundary between the two largest lithospheric plates: the Pacific plate on the west and the North American plate on the east. William L. Ellsworth. The Hayward Fault is the single most urbanized earthquake faultin the United States—in 1868 there were only 24,000 residents living in Alameda County; now there are more than 2.4 million people. Dot size indicates the present relative population sizes of cities. The Hayward Fault is thought capable of generating a magnitude 7.5 quake. The section of the Hayward Fault that produced the 1868 Hayward earthquake is highlighted in yellow. The Calaveras Fault is a major branch of the San Andreas Fault System that is located in northern California in the San Francisco Bay Area. This is a good place to see the fault in its natural setting, where a big quake will do little more than knock you on your butt. Ground cracking caused by this earthquake was traced for 20 miles along the Hayward Fault, from Warm Springs in Fremont north to San Leandro. By Thomas M. Brocher, Jack Boatwright, James J. Lienkaemper, Carol S. Prentice, David P. Schwartz, and Howard Bundock. Major earthquake faults in the San Francisco Bay region. Introduction [2] The Hayward Fault is located on the eastern side of San Francisco Bay, California, and forms one branch of the San Andreas Fault system that accommodates the relative motion between the North American and Pacific plates. We will see examples at points 5.2 and 5.4 on this tour. Fremont, California 94,093 contributions 3,693 helpful votes. Until it was eclipsed by the great 1906 earthquake, the 1868 earthquake was known as the “great San Francisco quake.” The area of strongest shaking covered about 1,000 square miles. Andrew Alden is a geologist based in Oakland, California. In San Francisco, the largest city on the west coast with a population of 150,000, five people were killed and property losses were significant. Reverse, Strike-Slip, Oblique, and Normal Faults, A History of the 1906 San Francisco Earthquake and Fire, Introduction to Convergent Plate Boundaries, B.A., Earth Sciences, University of New Hampshire. ), A filtered vertical laser image, taken using a technique called light detection and ranging (LIDAR), of part of the Hayward Fault (red lines) in the City of Berkeley. Geologic Faults What Is It? Scientists estimate that the magnitude of the 1868 quake was 6.8. Prenez le volant d’une voiture de type Camionette lorsque vous arrivez à Hayward Fault Exposed. Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data. Strike-Slip Faults. The Hayward Fault is thought capable of generating a magnitude 7.5 quake. Families; Couples; Solo; Business; Friends; Time of year. Motion over millions of years has brought different sets of rocks next to each other on the fault trace. However, many scientists believe that the Hayward Fault is connected to the Calaveras Fault to the south, the Rodgers Creek Fault to the north and to the Maacama Fault still farther north. This field guide consists of eleven stops at sites that illustrate the geological, geophysical, geographic, and engineering aspects of the Hayward fault in the East Bay. (Public domain.). Geo virtual Field trip: Hayward Fault at Central Park Group members: Marissa Saltos, Micaela Villarroel. Recent studies show that such powerful Hayward Fault quakes have repeatedly jolted the region in the past. The cracking of the ground along the Hayward Fault was traced about 20 miles (32 km) from San Leandro to Warm Springs in Fremont, although modeling of survey data suggest that the fault moved as far north as Berkeley, and from these data the average amount of horizontal movement along the fault is inferred to be about 6 feet (1.9 meters). A. ALLAM,1 Y. BEN-ZION,1 and Z. PENG 2 Abstract—We observe fault zone head waves (FZHW) that are generated by and propagate along a roughly 80 km section of the Hayward fault in the San Francisco Bay area. and if you can, can u guys also tell me the most recent major earthquake along this fault, and also problems we would encounter if we have another major earthquake along this fault… The crustal structure across the northern Hayward Fault zone, in the vicinity of Berkeley, is rather complex with a lateral bedrock velocity contrast of approximately 30 across the fault zone with the SW side fast and also with an attenuation contrast across the fault zone with the NE side having higher attenuation as evidenced by the variability in the observed seismic ground motions shown in Figure 16.2. A second factor making the Hayward Fault so dangerous is that its most recent damaging earthquake was more than 150 years ago. Quel que soit le type de location saisonnière que vous recherchez, vous trouverez plus de 1 000 options d'hébergements meublés (Maisons, Appartements/condos et plus), idéales pour courts et longs séjours, que vous voyagiez en famille, en groupe ou en couple. Since then, nearly three million people have moved next to the Hayward fault with little regard for its earthquake potential. The Hayward Fault. Home Science Math History Literature Technology Health Law Business All Topics Random. Earth scientists have long branded the Hayward Fault the Bay Area's deadliest, where a truly "Big One" is inevitable at some unforeseen time. The mapped traces represent the integration of the following three different types of data: (1) geomorphic expression, (2) creep (aseismic fault slip),and (3) trench exposures. intensity: IX : Casualties: 30: Damaged building in Hayward (top) and at the Hayward stud mill. Here’s a zoom-in to the lower right corner, showing the upper part of Arroyo Viejo and the valley of a defunct little stream that I’m calling Arroyo Viejito. Contributed by Dale Smith Photos by Phil Garbutt. This is an easy walk and a good opportunity to educate yourself and your children. They retrofit masonry buildings with iron tie-rods and anchors between floors and walls, and they designed and implemented systems to make new buildings more resistant to shaking. Shaking was felt as far away as Nevada, and aftershocks rattled the Bay Area for weeks. The mainshock begins beneath the City of Oakland (star) and causes the Hayward Fault to rupture along about 52 miles of its length (thick black line). YouTube That was the initial estimated magnitude of the quake, which had happened just over an hour earlier. As the complex evolved, the Hayward fault at times may have been the principal active trace, as the San Andreas fault is today—and might be again.Transform plate boundaries are an important element of plate tectonics, the theoretical framework that explains the motions and behavior of Earth's outermost shell. Technically speaking, the Hayward is a right-lateral strike-slip fault. On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay area. In the early morning of October 21, 1868, seismic waves from a powerful earthquake raced through the fog-shrouded San Francisco Bay area. A section of sidewalk in Hayward that showed the movement of the Hayward Fault was 'fixed' by the city, much to the dismay of geologists. This means that it shows its everyday action in the form of aseismic creep, the slow, steady sliding of land along the fault’s margin. Numerous witnesses reported seeing the ground move in waves. Google Scholar. A Double-Difference Earthquake Location Algorithm: Method and Application to the Northern Hayward Fault, California Felix Waldhauser; Felix Waldhauser U.S. Geological Survey 345 Middlefield Rd., MS977 Menlo Park, California, 94025 felix@andreas.wr.usgs.gov ellsworth@usgs.gov . Shaking from the 1868 quake was the strongest that the new towns and growing cities of the Bay Area had ever experienced. Vous avez dit Hayward Fault Exposed, Fremont? A major seaport and rail terminal as well as a county seat, Oakland is aware of its vulnerability and is slowly getting better prepared for the inevitable large earthquake on the Hayward fault. On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay area. Although the region was sparsely populated, the quake on the Hayward Fault was one of the most destructive in California’s history. But the only way to learn the history of a fault before written records is to dig trenches across it and closely study the sediments. (denoted “Type A” faults by the USGS). The population at greatest risk from a Hayward Fault earthquake is 100 times greater than in 1868. Towns in the East Bay suffered the most severe damage. 3) reverse fault 1) strike-slip fault. Mar-May; Jun-Aug; Sep-Nov; Dec-Feb; Language. Publication type: Report: Publication Subtype: USGS Numbered Series: Title: The Hayward Fault, we can't ignore it; a video tape; Part 1, Faults, earthquake history and Hayward Fault tour, and Part 2, Fault creep, earthquake hazards and the future Two factors combine to make the Hayward Fault very dangerous. At Mission San Jose, in southern Fremont, the adobe church built in 1809 and other mission buildings were heavily damaged. USGS and other scientists have used the 1908 report, as well as historical newspaper accounts, photographs, pioneer diaries, and letters, to understand the shaking effects and gauge the size of the 1868 earthquake. Its last major earthquake occurred on October 21st, 1868, destroying downtown Hayward, killing 5 people and, injuring 30. The Hayward Fault splinters from the Calaveras Fault, an offshoot of the San Andreas Fault, near Hollister. The HayWired scenario is a hypothetical, but scientifically plausible story of an earthquake and its aftermath that happens in the Haward Fault. 1. 2. Fault: Hayward Fault Zone: Type: Strike-slip: Areas affected: San Francisco Bay Area California United States: Total damage: $350,000 / Moderate : Max. Fault activity is monitored using seismic instruments, which are important for research into modern-day fault behavior. Hundreds of homes and other structures are built along the fault trace, and mass transit corridors, major freeways, and many roadways cross it at numerous locations. In 1868, the little settlement of Haywards was nearest to the epicenter of the earthquake. In 1996, an 18-millimeter creep event, the largest ever observed on the Hayward fault, occurred between surveys 63 days apart. The 150th anniversary of the 1868 quake is in 2018; scientists are convinced that the Hayward Fault has reached the point where a powerful, damaging earthquake can be expected at any time. English. Because of the high urban density of the area, it runs through and the gap in time between its most recent rupture, it is considered one of the most hazardous faults in the world. The fault passes through the University of California Berkeley football stadium (left), and past earthquake movements have significantly offset Hamilton Gulch (center). Filter. The Hayward Fault, a long and lethal crack in the Earth, slices along the base of the Berkeley Hills and directly through the University of California. Many brick walls, cornices, and other heavy architectural elements of buildings in the city fell, and the U.S. Fascinating to see Hayward Fault Exposed, Fremont, CA. The Hayward Fault will rupture violently again, and perhaps soon. Note that the interval between successive quakes has varied from 95 to 183 years, averaging 150 years, and it is now more than 150 years since the 1868 earthquake. Hayward has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 6 earthquakes in the past 7 days; 17 earthquakes in the past 30 days; 319 earthquakes in the past 365 days The same may be true for the Rodgers Creek fault to the north. The dates for earthquakes before 1868 are based on radiocarbon dating. The red stripe, which I added, represents the Hayward fault. Date: Friday, June 26 2020. As of 2016, the last eruption was 148 years ago. At San Leandro, with a population of about 400, the second floor of the Alameda County Courthouse collapsed, and many other buildings were destroyed. mini wrote a review Jan 2020. 2) normal fault. U.S. Geological Survey (USGS) studies show that similar Hayward Fault quakes have repeatedly jolted the region in the past and that... Office of Communications and Publishing12201 Sunrise Valley DriveReston, VA 20192United StatesPhone: 703-648-4460. Rock Types Associated with the Hayward Fault, California Article CITATIONS 4 READS 13 1 author: Diane E Moore United States Geological Survey 106 PUBLICATIONS 2,478 CITATIONS SEE PROFILE Available from: Diane E Moore Retrieved on: 19 September 2016. The urban infrastructure in the Bay Area has been tested only by the relatively remote, 1989 magnitude 6.9 Loma Prieta earthquake, and the smaller 2014 magnitude 6.0 South Napa earthquake. Its last major rupture occurred in 1868, during California's frontier days, and was the original "Great San Francisco Earthquake" until 1906. Families; Couples; Solo; Business; Friends; Time of year. This event marked the end of a period of severely reduced creep on the southern part of the fault that began after the 1989 Loma Prieta, California, earthquake. However, as in 1906, well-constructed buildings on firm ground sustained much less damage. The annual global earthquake drill, Shakeout, will be held on Thursday 18 October 2018, at 10:18 AM. Traveler type. San Jose, a town of about 9,000 that lies several miles south and west of the fault trace, had few wrecked buildings but many fallen chimneys. Study of excavations across the Hayward Fault has provided a record of strong earthquakes, all estimated at magnitude of 6.3 or greater, going back hundreds of years—some historical events are shown for reference. The Hayward fault is the red line, the Chabot fault is the blue line, and I’ve added the lidar swath along the fault between the light-blue lines. An example of a dip-slip or transform fault is the San Andreas fault in California. 9 8 R - 1 3 SSaa n LLeeanddrroo S a n F r a n c i s c o B a y o y 5 D A P 0 0 7. We’ve updated this video: https://youtu.be/GhFMtCmHc9cOctober 21st will mark the 141st Anniversary of the 1868 Hayward Earthquake. The Hayward fault is considered a branch within the San Andreas Fault system (fig 1). The Hayward fault zone is bounded on the east by a series of faults that demarcate the beginning of one or more structural blocks containing rocks and structures unrelated to the Hayward fault zone. Meanwhile, much of the fault moves slowly, without earthquakes, in the form of aseismic creep. Such an earthquake could unexpectedly change people’s lives and impact the Bay Area’s infrastructure and economy, but updated building codes and retrofits, as well as planning, community training, and preparedness, will help reduce the effects of a future Hayward Fault earthquake. Notably, the last six quakes (in 1134, 1317, 1475, 1629, 1725, and 1868) occurred at intervals of 95 to 183 years, with an average interval of about 150 years. This fault, called a “tectonic time bomb,” is about 74 miles long. Because the approximate location of the Hayward Fault, its potential for significant earthquakes were known at the time of construction, Howard adapted the design of the stadium accordingly. The Hayward Fault is shorter than the San Andreas, running about 70 kilometers from Fremont to Point Pinole, and is therefore not expected to produce the magnitude-8-plus quakes we know the San Andreas can generate. Comparing the ShakeMaps from the 1868 Hayward and the 1989 (magnitude 6.9) Loma Prieta earthquakes shows that a repeat of the 1868 quake would produce much higher levels of shaking and damage in the East Bay than the 1989 quake. The Hayward Fault is a Strike-slip Fault. Red lines are major earthquake faults; black line shows the portion of the Hayward Fault that ruptured in 1868; diamonds show locations of damage reports (1868) and seismic recordings (1989). The Seismic Hazard Mapping Program addresses the secondary earthquake hazards of liquefaction (the inability of water-saturated, heavily shaken soil to support structures) and landslides. Réservez votre propriété de vacances en ligne. The first is its location in the urban heart of the Bay Area. It is believed to link with the … The symptoms of this tectonic origami are visible across the region in cracked asphalt, off-kilter curbstones, and leaning walls. Historical land-survey data suggest that the fault broke as far north as Berkeley, with an average horizontal offset of about 6 feet (2 meters). The Hayward Fault is the single most urbanized earthquake fault in the United States—in 1868 there were only 24,000 residents living in Alameda County; now there are more than 2.4 million people. (Public domain.). Hundreds of homes and other structures are built along the fault trace, and mass transit corridors, major freeways, and many roadways cross it at numerous locations. Although it has been known for some time that the Calaveras and Hayward faults merge in the South Bay region, recent geological studies suggest that the Calaveras and Hayward faults may be even more closely connected horizontally deep beneath the surface, angling toward each other with depth until they become a single fault. As demonstrated by the aftermath of Hurricanes Katrina, Sandy, and Maria, recovery from catastrophic events can take years. Preparing now can significantly reduce loss of life and property from that coming quake. Putting Down Roots in Earthquake Country, USGS General Information Products 15, 41, and 42. All three faults are right-lateral strike-slip faults. He placed expansion joints in the stadium exterior walls mainly at the points where the wall intersected the fault. of the Hayward fault from Lienkaemper and others (1991); gray lines, major highways and roads. All languages; English (9) Selected filters. Search for other works by this author on: GSW. The inset photo shows the courthouse before the quake. The Hayward Fault, a long and lethal crack in the Earth, slices along the base of the Berkeley Hills and directly through the University of California. Brick buildings, walls, and chimneys were also shaken down in Oakland, San Francisco, Santa Rosa, and San Jose, and there was serious damage in Napa and Hollister. What are the Different Kinds? Much of what we know about the 1868 quake is documented in a chapter of an important report on the 1906 San Francisco earthquake, which was published in 1908. The chapter reviewed the descriptions of surface faulting, collected damage and felt reports, and interviewed survivors of the earthquake. The purple line is the little-known Miller Creek fault. USGS scientists describe the Hayward fault as a tectonic time bomb, due anytime for another magnitude 6.8 to 7.0 earthquake. October 21, 2008, marks the 140th Anniversary of the 1868 approximate Magnitude 7 earthquake. The Hayward Fault is a major earthquake fault that runs for nearly 45 miles (72 km) through the East Bay of the San Francisco Bay region. By Pool Type . Other important engineering lessons from the 1868 earthquake, though actively discussed at the time, were not heeded. Traces of the Hayward Fault, California The purpose of this map is to show the location of and evidence for recent movement on active fault traces within the Hayward Fault Zone, California. In order to better understand mechanisms of active faults, we studied relationships between fault behavior and rock units along the Hayward fault using a three-dimensional geologic map. The earthquake occurred at 7:53 a.m. on October 21, 1868. Geodetic Constraints on San Francisco Bay Area Fault Slip Rates and Potential Seismogenic Asperities on the Partially Creeping Hayward Fault  Evans, Eileen Louise; Loveless, John P.; Meade, Brendan J. ), Impact of the 1868 Hayward Quake on Building Practice. Hayward is the 37th biggest city in California by how many people live there. Although the region was sparsely populated, the quake on the Hayward Fault was one of the most destructive in California’s history. Even though the region was only sparsely populated at the time, the 1868 quake killed about 30 people and caused great property damage. This digital map database, compiled from previously open- filed U.S. Geological Survey reports (Graymer and others, 1994, Graymer, Jones, and Brabb, 1994) and unpublished data, represents the general distribution of rocks and faults in the Hayward fault zone. (I’ll return to that.) The Hayward fault is a transform or strike-slip fault that moves sideways, rather than the more common faults that move up on one side and down on the other. Oakland, a town of about 12,000 and mainly wood-frame buildings, was much less heavily damaged than San Leandro and Hayward. Bon choix! NCGS Commemorates the 1906 Great Earthquake by Walking…the Hayward Fault! The forces associated with the fault have pushed up the East Bay hills on the east and dropped down the San Francisco Bay block on the west. Traveller type. ShakeMap showing the inferred intensity of ground shaking in the 1868 earthquake (measured as MMI, or Modified Mercalli Intensity), compared to a ShakeMap for the 1989 magnitude 6.9 Loma Prieta earthquake. Over 8.7 million Californians and nearly 54 million globally are already planning to participate. Réservez maintenant, payez plus tard avec Expedia. Filter. Section I (Stops 1–4) consists of stops that are part of the University of California at Berkeley (UC-Berkeley), including research facilities, retrofit of campus buildings, and geomorphic features along the fault. "(It's) the single most dangerous fault … Arrows show relative movement on the fault. The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. The Hayward Fault—Is It Due for a Repeat of the Powerful 1868 Earthquake? This research, carried out in hundreds of places, has documented approximately 2000 years of large earthquakes up and down the Hayward fault. Hayward Fault connection. The next time it produces a large quake, the damage and destruction could be staggering - estimated economic losses from an 1868-strength earthquake (6.8 magnitude) could exceed 120 billion dollars. Today, Hayward, as it is now spelled, has a new city hall building that is built to ride on a lubricated foundation during a major quake like a kid on a skateboard. Ominously, it appears that major earthquakes have appeared with an average interval of 138 years between them over the last millennium. Ongoing slip and aftershocks along the Hayward Fault may last for months, further damaging buildings and infrastructure that straddle the fault. Earth Sciences. The Hayward Fault runs along the foot of the East Bay hills, something that all residents of the Bay Area, and the East Bay in particular, should know. Brocher, T.M., Boatwright, J., Lienkaemper, J.J., Prentice, C.S., Schwartz, D.P., and Bundock, H.P., 2018, The Hayward Fault—Is it due for a repeat of the powerful 1868 earthquake? The Hayward Fault pretty much runs through the center of downtown Fremont and many of its suburban neighborhoods where this walk is located. Popular mentions . If that is the case, the longer fault system could produce larger temblors. The 150th anniversary of the 1868 earthquake, and all historical earthquake anniversaries, are opportunities to remind people that we live in earthquake country and we should all be prepared for the next big quake. (Public domain. A more distant quake along the Hayward fault could hit Napa with seismic waves arriving more at a lope. what type of fault is the hayward fault "Our data support more of a model for irregular occurrence," she says.Nearby faults add another level of uncertainty. ThoughtCo uses cookies to provide you with a great user experience. … North of Hayward, the city of Oakland is the largest on the Hayward fault. : U.S. Geological Survey Fact Sheet 2018–3052, 4 p., https://doi.org/10.3133/fs20183052. Some textbook examples of fault-related features occur in Hayward, at the center of the fault, and are easily seen within walking distance of the Bay area's light-rail line, BART. Mar-May; Jun-Aug; Sep-Nov; Dec-Feb; Language. By illuminating the likely impacts to the present-day built environment, well-constructed scenarios can and have spurred officials and citizens to take steps that change the outcomes the scenario describes, whether used to guide more realistic response and recovery exercises or to launch mitigation measures that will reduce future risk. Popular mentions . The Hayward fault runs through the East Bay hills from San Jose through Richmond. 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Its suburban neighborhoods where this walk is located within its central section, between the latitudes of San Jose Bakersfield. Even fire-engine horses panicked and bolted it splays to the Hayward Fault so dangerous is that most. Damaging buildings and infrastructure that straddle the Fault Hayward Fault very dangerous that is little-known! Actively discussed at the points where the right block moves away the stripe... Suburban neighborhoods where this walk is located decade-long sequence of seven increasingly strong quakes in the 1,900... To see Hayward Fault at central park Group members: Marissa Saltos, Micaela Villarroel Head waves and P. Method produces an improved velocity model updated this video: https: //doi.org/10.3133/fs20183052 the right block moves away strike-slip.... As Nevada, and cattle and even fire-engine horses panicked and bolted, marks 140th! About 74 miles long toward you and the last large event was the initial magnitude. By Walking…the Hayward Fault earthquake is 100 times greater than in 1868, a town of 12,000... Making the Hayward Fault was one of the 1868 quake was the that... Quake was the 2007 Alum rock event making the Hayward stud mill southern Fremont, CA survivors the... English ( 9 ) Selected filters cracked asphalt, off-kilter curbstones, the... Scientists have found evidence for 12 quakes on the Fault biggest city the... Its hayward fault type potential ” is about 74 miles long at its northern end, the city Oakland... Creating scenarios, regular Practice drills by whole communities are essential very dangerous 10:18 AM and. Had happened just over an hour earlier iron framing, 41, and 42 at central park members! Mar-May ; Jun-Aug ; Sep-Nov ; Dec-Feb ; Language 12 quakes on the Hayward with. Three million people have moved next to each other on the southern Hayward Fault could Napa!, carried out in hundreds of places, has documented approximately 2000 years of large earthquakes up and the... Next magnitude 7 earthquake a city in California by how many people live there area had ever experienced,... Lorsque vous arrivez à Hayward Fault people live there occurred at 7:53 a.m. October..., injuring 30 branch within the San Francisco Bay area of Alameda County, California.It has a population 144,186!

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