Santa rosa history sonoma county history told through. The 2003 working group for california earthquake probability assigned a 27% probability that the haywardrodgers creek fault system would produce a magnitude 6. Some sections of the san andreas fault system in san. The rodgers creekmaacama fault system in the northern california coast. 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. Oct 21, 2016 scientists just discovered a missing link between san franciscos faults. It is up to all of us to be prepared and to act intelligently when it happens. Earthquake scientists today say theres a 62 percent chance of an earthquake with a magnitude 6. Geological survey have mapped the active surface trace of the rodgers creek fault through the central. And, researchers say, the odds of that happening along the rodgers creek fault is 33 percent. A virtual tour of the hayward fault including information. 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.
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. The san andreas fault system is a 0kmlong transform boundary that accommodates motion between the north american and pacific plates. All of these faults are right lateral strikeslip faults, meaning that. Scientists discover sonoma county earthquake fault connected to. Scientists say sections of san andreas fault are overdue for major earthquake dahboo77.
Rodgers creek fault traced through santa rosa usgs. 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. The rate and distribution of creep are therefore important parameters when assessing the seismic hazard posed by such faults. 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. Rogers author of worlds great men of color, volume i. 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. Northern california area faults earthquake faults map.
Bay area earthquakes are latest warning of destructive. So, rodgers creek appears to have retired the tolay. For the entire california region, the fault with the highest probability of generating at least one magnitude 6. Bay areas next big quake due on rodgers creek fault. Scientists just discovered a missing link between san franciscos faults. Scientists say sections of san andreas fault are overdue. The timing of faulting and basin formation is determined from the. The surname rodgers was originally a germanic personal name derived from the elements hrod, or renown combined with geri, or spear. There is more than one author by this name in the goodreads data base. Its possible that if the hayward interacts with a fault like the nearby rodgers creek to the north, the resulting temblor might register. Latest headlines world news you mag event books promos mail shop. Sonoma county has a lot of fault lines running through it. The books homepage helps you explore earths biggest bookstore without ever leaving the comfort of your couch. The nearest aligned fault to the north, the rodgers creek fault, is considered by many to be an extension of the hayward fault zone.
Photo of the san andreas fault near gorman california. The san andreas fault superimposed over the california landscape seen in a shuttle photo. History and prehistory of earthquakes in wine and redwood country, sonoma and. 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. 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. The maacama fault lies to the east of the healdsburg fault and continues northward, passing east of the city of cloverdale.
Click ahead to see the major faults of the bay area. 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. Hayward fault could cause greatest natural disaster ever to.
According to a 2016 study by the usgs, there is a 72 percent chance of a major earthquake of 6. 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. The soils belong to the haire series of gravelly loams, alluvially deposited into rocky fans and terraces, which drain freely. Rodgers creek fault connects southward to other faults that merge into the san andreas fault. 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. Sep 19, 2005 anticipating the big one best preparation for quake assumes worstcase scenario. A hayward fault megaquake could cause greatest natural disaster ever to hit the us, warn experts. Creep on the rodgers creek fault, northern san francisco bay area. The largest earthquake in recorded history on this fault occurred in. The continuous line between the two areas is the missing link between the hayward and the rodgers creek faults. Testing the inference of creep on the northern rodgers creek fault.
Online shopping from a great selection at books store. Scientists just discovered a missing link between san. 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. Jan 05, 2018 the average interval of the past 11 earthquakes on this segment of the fault is 170 80 years.
A new more detailed and higher resolution map of the rodgers creek fault in. 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. The complete fault zone, including the rodgers creek fault, is divided by seismologists into three segments rodgers creek, northern hayward, and southern hayward. Two san franciscoarea earthquake faults found to be. Probabilities of one or more large earthquakes in san francisco bay regioo 31 b1. Missing link between the hayward and rodgers creek faults. 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. The fault just west of the rodgers creek fault north of san pablo bay is called the tolay fault. Hayward and rodgers creek fault segment parameters 24 8. 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. Fault, the greenville fault, the rodgers creek fault and the san gregorio fault.
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. Surface faulting near livermore, california associated. 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. New maps detail wider rodgers creek fault through santa rosa. The rodgers creek and maacama faults are major strands of the san andreas fault system in northern california. The rodgers creek fault could trigger a magnitude7. Evolution of the rodgers creekmaacama rightlateral fault system. The worst damage of sonoma county 24 words bartleby. The san andreas fault and many other northern california fault zones are running northsouth.
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. Hecker, who investigates the history of quakes along the rodgers creek fault, has found evidence to suggest that might have happened once. 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. The northern haywardrodgers creek fault enters sonoma county at san pablo bay and extends northward through the city of santa rosa. 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. A new map of rodgers creek fault in sonoma county, california. For northern california, the most likely source of such earthquakes is the hayward rodgers creek fault 31% in the next 30 years. The underwater surveys revealed a previously unknown strand of the hayward fault that connects to the western section of the rodgers creek fault. New maps are out detailing where the rodgers creek fault, which researchers say is ripe for a magnitude 6. The rodgers creekmaacama fault system is one such domain of extensional rightlateral faults and releasing bend basins, though the longterm history of. 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. Healdsburg fault, which lies between the maacama fault and the rodgers creek fault.
Here youll find current best sellers in books, new releases in books, deals in books, kindle ebooks, audible audiobooks, and so much more. 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 last time there was a big earthquake along the fault was in. 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 of fault creep, and three fault sections, near hayward, rodgers creek and green valley, are nearing or past their average recurrence interval. 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. A massive quake could be only the beginning of the bay areas woes. The most recent large earthquake on the rodgers creek. Same goes for rodgers creek fault in sonoma county. Their connection has been debated for years but, as a.
Creep on the rodgers creek fault, northern san francisco bay. Griffins lair sits at the foot of sonoma mountain, a formation cleaved by three active fault zones. South of fremont the fault branches into a complex set of surface faults that connect the hayward fault. Geological survey has a new website that offers a virtual tour of the hayward fault. Whether it is rodgers creek, san andreas, loma prieta or some other fault, sooner or later santa rosa will suffer the effects of a major earthquake. Probabilities of earthquakes along san andreas fault 23 6. Work optimization predicts the evolution of extensional. It was a name given to a famespear or one who was a skilled soldier. Sonoma county earthquake hazard abag resilience program. Earthquakes of santa rosa lomita heights neighborhood. Probabilities of earthquakes along hayward and rodgers creek faults 28 9.
Extent of the hayward rodgers creek fault zone shown in red. 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. Two bay area earthquake faults found to be connected. 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. Hazard mitigation plan approval pending adoption draft. The hayward fault zone is a geologic fault zone capable of generating destructive. The faults shown here are represented by simple lines which do not show how deep and large they really are. 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. 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. Welcome to the second annual kqed quest science blogs bay area.
The orange, beanshaped area represents the dense, magnetic body of rock on the east side of the fault beneath santa rosa. Powerful earthquake faults threaten napa on 2 sides. The usgs said in 2016 that a large earthquake on the rodgers creek fault has the potential to intensely shake the. 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. Creep on the rodgers creek fault, northern san francisco. The most recent large earthquake on the rodgers creek fault. North of san pablo bay is the rodgers creek fault, which was shown in 2016 to. 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. A major quake on this fault is likely to devastate downtown and incapacitate most city and county facilities.
The missing link university of california, berkeley. 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. 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. 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.
The rogers book covers the companys east coast beginnings, the covington, oh era, english rogers, the cbs era, and much more. 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. 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. 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. 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. 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. 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. History and pre history of earthquakes in wine and redwood country, sonoma and mendocino counties, california.
Rogers has 60 books on goodreads with 73017 ratings. Scientists discover sonoma county earthquake fault. The largest quake on the hayward fault in recorded history occurred in 1868. The fault with the highest probability of generating at least one earthquake of magnitude 6. Planning scenario for a major earthquake on the rodgers creek fault in the. This basin is already known, from an earlier study of the damaging 1969 santa rosa and 1906 san francisco earthquakes. The rodgers creek fault rcf is a principal component of the san andreas fault system north of san francisco.
Yellow lines on either side of the fault are the boundaries of the lidar survey. Evolution of the rodgers creekmaacama rightlateral fault. 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. Planning scenario for a major earthquake on the rodgers creek. Where the faults enter the bay, their projections are separated acrossstrike by. Abstract we revisit the question of whether the rodgers creek fault in northern california is creeping, a question with implications for seismic. The tolay fault, previously thought to be a major dextral fault, is part of a foldandthrust belt that does not exhibit lateral displacement. The hayward fault, the most populated in the world, and the rodgers creek fault are believed to be linked underneath the san pablo bay. Its longer and more complex than we thought remote sensing technology reveals surface traces of the fault covered by trees and buildings. Littleknown fault suspected in northern california quake.
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 rodgers creek fault passes through sonoma mountain and its north end terminates within santa rosa. The hayward rodgers creek fault zone is considered the most likely bay area fault to experience an earthquake with moment magnitude m of. The creeping segments are located in areas of local transtension, suggesting that lowered normal stresses may play a role in the distribution of creep. Anticipating the big one best preparation for quake assumes. Work optimization predicts the evolution of extensional step. The rodgers creekmaacama fault system in the northern california coast ranges united states takes up substantial rightlateral motion within the wide transform boundary between the pacific and north american plates, over a slab window that has opened northward beneath the coast ranges. Less efficient faults form wider basins and develop with reduced propagation power.
Rodgers creek, northern calaveras and green valley. Theres no law on the books that require cities to keep record of what structures were. The epicenter was in the fultonmark west area, which is on the rodgers creek fault zone. 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. 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. 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 largest earthquake in recorded history on this fault.
History and prehistory of earthquakes in wine and redwood. 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. Rodgers creek fault zone, maacama fault zone, alexanderredwood hill fault, hunting creekberryessa fault zone, and west napa fault zone. Probabilities of large earthquakes in the san francisco. The rodgers creek and maacama faults are major strands of the san. The earliest origins of the family name rodgers date back to the anglosaxon culture of britain. Mar 01, 2011 the fault with the highest probability of generating at least one earthquake of magnitude 6.
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