Five major fault lines criss cross the bay area, including the rodgers creek fault that runs through santa rosa and sonoma county, and the san andreas that sits just offshore. Bay areas next big quake due on rodgers creek fault. The largest quake on the hayward fault in recorded history occurred in 1868. Probabilities of earthquakes along hayward and rodgers creek faults 28 9. A direct link enables simultaneous rupture of the hayward and rodgers creek faults, a scenario that could result in a major earthquake m 7. Two earthquake faults meet near san francisco, could. A new more detailed and higher resolution map of the rodgers creek fault in. Probabilities of earthquakes along san andreas fault 23 6.
Their connection has been debated for years but, as a. Topography, fault characteristics, and earthquake history along the san andreas system when viewed from an airplane, almost any part of the san andreas fault appears on the ground as a sharp linear scar that cuts across all features of the landscape, displacing ridges, valleys, and streams faster than they can be smoothed by erosion and deposition. Hecker, who investigates the history of quakes along the rodgers creek fault, has found evidence to suggest that might have happened once before, in the early 1700s. The books homepage helps you explore earths biggest bookstore without ever leaving the comfort of your couch. Jan 02, 2020 this is the regional fault thats gone the longest without a major quake in recent history, and thus could likely cause one in the next few decades. Earthquake scientists today say theres a 62 percent chance of an earthquake with a magnitude 6. Scientists just discovered a missing link between san. The most recent large earthquake on the rodgers creek fault. So, rodgers creek appears to have retired the tolay. Creep on the rodgers creek fault, northern san francisco bay. Missing link between the hayward and rodgers creek faults. Creep on the rodgers creek fault, northern san francisco bay area. The petaluma basin formed as part of the contra costa basin in the late miocene and was displaced to its present location along the rodgers creek hayward and older faults. New maps detail wider rodgers creek fault through santa rosa.
Models with initial fault geometries that more closely match the shallowly imaged hayward and rodgers creek faults suggest that the faults link at seismogenic depths if a mapped segment of the rodgers creek that extends into the san pablo bay is currently inactive. The hayward fault is one of the secondary faults in this diffuse zone, along with the calaveras fault to the east and the san gregorio fault, west of the san andreas. The rodgers creek fault passes through sonoma mountain and its north end terminates within santa rosa. The rodgers creek fault, known as a strikeslip fault, runs from san pablo bay at the southern tip of sonoma county north through santa rosa to healdsburg. Here youll find current best sellers in books, new releases in books, deals in books, kindle ebooks, audible audiobooks, and so much more. The soils belong to the haire series of gravelly loams, alluvially deposited into rocky fans and terraces, which drain freely. Surface faulting near livermore, california associated. This basin is already known, from an earlier study of the damaging 1969 santa rosa and 1906 san francisco earthquakes. Oct, 2014 four urban sections of the san andreas fault system in northern california have stored enough energy to produce major earthquakes, according to a new study that measures fault creep. Likely a northern extension of the hayward fault, the fault occurs as the pacific tectonic plate moves north and the north america plate slides south. A new map of rodgers creek fault in sonoma county, california. Geological survey have mapped the active surface trace of the rodgers creek fault through the central. There is more than one author by this name in the goodreads data base. Two san franciscoarea earthquake faults found to be.
Oct 19, 2016 the haywardrodgers creek fault zone is considered the most likely bay area fault to experience an earthquake with moment magnitude m of. Creep on the rodgers creek fault, northern san francisco. Less efficient faults form wider basins and develop with reduced propagation power. Geology, geochronology, and paleogeography of the southern. Extent of the hayward rodgers creek fault zone shown in red. For the entire california region, the fault with the highest probability of generating at least one magnitude 6. Griffins lair sits at the foot of sonoma mountain, a formation cleaved by three active fault zones. Photo of the san andreas fault near gorman california.
North of san pablo bay is the rodgers creek fault, which was shown in 2016 to be linked with the hayward fault under san pablo bay to form a combined haywardrodgers creek fault that is 118 miles 190 km long, stretching from north of healdsburg through santa rosa down to alum rock in san jose. Scientists discover sonoma county earthquake fault connected to. In a 2016 report, geologists predicted that there is a 72 percent chance of one or more earthquakes of magnitude 6. Rodgers creek, northern calaveras and green valley. The orange, beanshaped area represents the dense, magnetic body of rock on the east side of the fault beneath santa rosa.
Sonoma county earthquake hazard abag resilience program. The rodgers creekmaacama fault system in the northern california coast. The hayward rodgers creek fault zone is considered the most likely bay area fault to experience an earthquake with moment magnitude m of. The tolay fault, previously thought to be a major dextral fault, is part of a foldandthrust belt that does not exhibit lateral displacement. Yellow lines on either side of the fault are the boundaries of the lidar survey. The rate and distribution of creep are therefore important parameters when assessing the seismic hazard posed by such faults. Powerful earthquake faults threaten napa on 2 sides.
History and pre history of earthquakes in wine and redwood country, sonoma and mendocino counties, california. Oct 10, 2007 certainly, the distribution of earthquakes along the fault, including the locations of the 1969 earthquakes, suggests some link between creep and microseismicity cataloged seismicity shows that events are concentrated on the portion of the rodgers creek fault that we believe to be creeping, whereas the southern, locked, portion is largely. The rodgers creek fault could trigger a magnitude7. Hecker and watt also note that the rate of creep along the hayward segment and the rodgers creek segment to the north are not the same.
A major concern for quakes throughout the north bay is that they rupture the ground near the wellknown rodgers creek fault, which in turn is a northern extension of the infamous hayward fault. Hazard mitigation plan approval pending adoption draft. Sep 19, 2005 anticipating the big one best preparation for quake assumes worstcase scenario. The rodgers creek fault rcf is a principal component of the san andreas fault system north of san francisco. The rogers book covers the companys east coast beginnings, the covington, oh era, english rogers, the cbs era, and much more. The surname rodgers was originally a germanic personal name derived from the elements hrod, or renown combined with geri, or spear. No evidence appears in the historical record of a large earthquake on the rcf, implying that the most recent earthquake mre occurred before 1824, when a franciscan mission was built near the fault at sonoma, and probably before 1776, when a mission and presidio were built in san. Bay area earthquakes are latest warning of destructive. Hecker, who investigates the history of quakes along the rodgers creek fault, has found evidence to suggest that might have happened once.
A major quake on this fault is likely to devastate downtown and incapacitate most city and county facilities. It is believed to be an ancestral northwest extension of the hayward fault, and perhaps has not been active in the past 20,000 years and perhaps not even in the past several hundred thousand years. The maacama fault lies to the east of the healdsburg fault and continues northward, passing east of the city of cloverdale. Work optimization predicts the evolution of extensional. Its possible that if the hayward interacts with a fault like the nearby rodgers creek to the north, the resulting temblor might register. All of these faults are right lateral strikeslip faults, meaning that. Rodgers creek fault zone in yellow larger image there were no deaths, but the press democrat reported there were six related injuries and eight were treated for heart attacks. According to a 2016 study by the usgs, there is a 72 percent chance of a major earthquake of 6. The missing link university of california, berkeley. Evolution of the rodgers creekmaacama rightlateral fault. Click ahead to see the major faults of the bay area. The last time there was a big earthquake along the fault was in. The worst damage of sonoma county 24 words bartleby.
Its longer and more complex than we thought remote sensing technology reveals surface traces of the fault covered by trees and buildings. Most earthquakes are very small and go unfelt, however every once and while there are massive earthquakes that cause tremendous damage to life and property. Apr 14, 2016 shaded relief image of the santa rosa area showing active faults black lines and the detailed rupture pattern of the rodgers creek fault where it crosses central santa rosa in red. For northern california, the most likely source of such earthquakes is the hayward rodgers creek fault 31% in the next 30 years. Scientists discover sonoma county earthquake fault. These five fault structures are the major known active slipstrike faults associated with the relative motion of the pacific plate to the north american plate in california at the latitude of the san francisco bay. The rodgers creekmaacama fault system is one such domain of extensional rightlateral faults and releasing bend basins, though the longterm history of. The san andreas fault system is a 0kmlong transform boundary that accommodates motion between the north american and pacific plates.
The hayward fault, the most populated in the world, and the rodgers creek fault are believed to be linked underneath the san pablo bay. Hayward fault could cause greatest natural disaster ever to. A massive quake could be only the beginning of the bay areas woes. Joel augustus rogers was a jamaicanamerican author, journalist, and historian who contributed to the history of africa and the african diaspora, especially the history of african americans in the united states. Work optimization predicts the evolution of extensional step. Some sections of the san andreas fault system in san. Earthquakes of santa rosa lomita heights neighborhood. The connection between the rodgers creek fault zone and the hayward fault zone was unclear until 2015 when a survey of the floor of san pablo bay found that the ends of the two faults were smoothly linked between point pinole and lower tubbs island.
Theres no law on the books that require cities to keep record of what structures were. The rodgers creek and maacama faults are major strands of the san andreas fault system in northern california. The hayward fault zone is a geologic fault zone capable of generating destructive. Evolution of the rodgers creekmaacama rightlateral fault system.
New maps are out detailing where the rodgers creek fault, which researchers say is ripe for a magnitude 6. Probabilities of one or more large earthquakes in san francisco bay regioo 31 b1. The existence of creep could significantly reduce expected moment release in future earthquakes on the rodgers creek fault, and thus has implications for seismic hazard assessment. The timing of faulting and basin formation is determined from the. The creeping segments are located in areas of local transtension, suggesting that lowered normal stresses may play a role in the distribution of creep. The complete fault zone, including the rodgers creek fault, is divided by seismologists into three segments rodgers creek, northern hayward, and southern hayward. The epicenter was in the fultonmark west area, which is on the rodgers creek fault zone. The rodgers creek fault, which lies east of the san andreas fault, is the main strand of the north americanpacific plate boundary north of san francisco bay. Welcome to the second annual kqed quest science blogs bay area.
Scientists say sections of san andreas fault are overdue. Rodgers creek fault connects southward to other faults that merge into the san andreas fault. Anticipating the big one best preparation for quake assumes. It is up to all of us to be prepared and to act intelligently when it happens. Littleknown fault suspected in northern california quake. History and prehistory of earthquakes in wine and redwood country, sonoma and. It includes a list of rogers endorsees, a comprehensive guide for dating equipment, a color section showing old catalogs and drum colors, the parts listings from all rogers catalogs, a list of current resources, and. The healdsburg fault continues along the east side of the cotati valley north of santa rosa, and the healdsburg fault is actually a stepover from the rogers creek fault. Rodgers creek fault zone, maacama fault zone, alexanderredwood hill fault, hunting creekberryessa fault zone, and west napa fault zone. Testing the inference of creep on the northern rodgers creek fault. The san andreas fault superimposed over the california landscape seen in a shuttle photo. The largest earthquake in recorded history on this fault occurred in. South of fremont the fault branches into a complex set of surface faults that connect the hayward fault.
Oct 21, 2016 scientists just discovered a missing link between san franciscos faults. Based on the potential for constraining longterm slip rates, we have used framework geologic mapping, new 40 ar 39 ar dating, and tephrochronology to establish a detailed chronostratigraphy for interpreting the offset history of the rodgers creekmaacama fault system. Santa rosa history sonoma county history told through. The history of californias two deadliest earthquakes. The earliest origins of the family name rodgers date back to the anglosaxon culture of britain. The fault just west of the rodgers creek fault north of san pablo bay is called the tolay fault.
Abstract we revisit the question of whether the rodgers creek fault in northern california is creeping, a question with implications for seismic. Californias san andreas fault may not be a vertical fault, as previously thought, but instead shaped like a propeller, affecting scientists understanding of how earthquakes along the fault shake out among surrounding communities. Online shopping from a great selection at books store. The largest earthquake in recorded history on this fault. Fault, the greenville fault, the rodgers creek fault and the san gregorio fault. A large earthquake on the rodgers creek fault that ruptures through the proposed asperity has the potential to intensely shake the sedimentary basin beneath santa rosa. A virtual tour of the hayward fault including information. Rogers has 60 books on goodreads with 73017 ratings. Latest headlines world news you mag event books promos mail shop. Healdsburg fault, which lies between the maacama fault and the rodgers creek fault. And, researchers say, the odds of that happening along the rodgers creek fault is 33 percent. Hayward and rodgers creek fault segment parameters 24 8.
Rodgers creek fault traced through santa rosa usgs. Scientists just discovered a missing link between san franciscos faults. North of san pablo bay is the rodgers creek fault, which was shown in 2016 to be linked with the hayward fault under san pablo bay to form a combined haywardrodgers creek fault that is 118 miles 190 km long, stretching from north of healdsburg through santa rosa down to. The fault with the highest probability of generating at least one earthquake of magnitude 6. The most recent large earthquake on the rodgers creek.
It was a name given to a famespear or one who was a skilled soldier. Rogers author of worlds great men of color, volume i. The 2003 working group for california earthquake probability assigned a 27% probability that the haywardrodgers creek fault system would produce a magnitude 6. Two earthquake faults meet near san francisco, could trigger next big one seismologists have determined that the hayward fault and rogers creek fault connect near san francisco bay and could. Sonoma county has a lot of fault lines running through it.
The bulletin of the california division of mines and geology collection is a series of publications published from 1888 to 2001 by the division and its predecessor agencies. Jan 05, 2018 the average interval of the past 11 earthquakes on this segment of the fault is 170 80 years. The most dangerous earthquake fault in the san francisco bay area is connected to another, which means both could rupture simultaneously and unleash major devastation, a. The hayward fault runs from san pablo bay in the north to fremont in the south, passing through the cities of berkeley, oakland, hayward, and fremont. New technologies and data reveal rich details about the present configuration of faults, distribution of strain, and associated seismic hazard on this complex network of faults. Two bay area earthquake faults found to be connected.
The continuous line between the two areas is the missing link between the hayward and the rodgers creek faults. Other active earthquake faults in the region include the san andreas fault, that passes as close as 20 miles southwest of the southeast greenway area. Aug 25, 2014 jittery californians and earthquakewatchers are asking themselves that question after sundays quake on the haywardrodgers creek fault the areas largest in 25 years struck the napa. No evidence appears in the historical record of a large earthquake on the rcf, implying that the most recent earthquake mre occurred before 1824, when a franciscan mission was built near the fault at sonoma, and probably before 1776, when a mission and. A hayward fault megaquake could cause greatest natural disaster ever to hit the us, warn experts. The underwater surveys revealed a previously unknown strand of the hayward fault that connects to the western section of the rodgers creek fault. Northern california area faults earthquake faults map. The virtual tour starts at the northern end of the hayward fault, where it enters san pablo bay, and flies south along the fault to fremont, showing along the way where the fault crosses freeways, runs through the university of california berkeley football stadium, and intersects residential.
The usgs said in 2016 that a large earthquake on the rodgers creek fault has the potential to intensely shake the. Scientists say sections of san andreas fault are overdue for major earthquake dahboo77. The rodgers creek and maacama faults are major strands of the san. Dec 27, 2012 i used this picture in last years quiz and have not been able to top it, so this will be the permanent holiday quiz photo.
The most recent large earthquake on the rodgers creek fault, san francisco bay area 859 30 years at 17%, greater than that on any other fault segment in the san francisco bay region. Planning scenario for a major earthquake on the rodgers creek fault in the. Probabilities of large earthquakes in the san francisco. Where the faults enter the bay, their projections are separated acrossstrike by. History and prehistory of earthquakes in wine and redwood. The two sides of the fault slip past each other at a rate of 610 mmyr, and it has been estimated that there is a 33% chance of a m 6. Mar 01, 2011 the fault with the highest probability of generating at least one earthquake of magnitude 6. The faults shown here are represented by simple lines which do not show how deep and large they really are. Planning scenario for a major earthquake on the rodgers creek. Geological survey has a new website that offers a virtual tour of the hayward fault.1458 296 546 249 246 1014 1492 1257 960 519 1512 8 1133 84 152 519 410 551 1195 32 363 1055 908 1491 1406 371 1327 379 965 1488 1093 140 770