<P> During the last 66 million years, nearly the entire west coast of North America was dominated by a subduction zone, with the Farallon Plate subducting beneath the North American Plate . Presently, the Juan de Fuca Plate (with its Explorer and Gorda satellite plates) and the Rivera and Cocos Plates are the only remnants of the once much larger Farallon Plate . The plate margin that remains in California is that of the strike - slip San Andreas Fault (SAF), the diffuse Pacific--North American plate boundary that extends east into the Basin and Range Province of eastern California and western Nevada (a seismically active area called Walker Lane) and southwest into the California Continental Borderland region off the central and southern coasts . This system of faults terminates in the north at the Mendocino Triple Junction, one of the most seismically active regions in the state, where earthquakes are occasionally the result of intraplate deformation within the Gorda Plate . It terminates in the south at the Salton Sea where displacement transitions to a series of spreading centers and transform faults, beginning with the Brawley Seismic Zone in the Imperial Valley . </P> <P> In the San Francisco Bay Area, the San Andreas system of faults spans offshore and into the East Bay area, with the bulk of the faults lying to the east of the main SAF . There is a 70% probability that one of these faults will generate a M6. 7 or greater earthquake before 2030, including the Hayward Fault Zone, which has gone beyond its average return period of 130 years . While the SAF north of San Francisco is quiet, the central SAF segment near San Juan Bautista is where fault creep was first studied, and to the south is where the recurring Parkfield earthquakes occur . The secondary faults lay to the west of the main SAF at the extreme southern portion, including the active and young San Jacinto Fault Zone, which may be taking over as the primary boundary south of Cajon Pass . A paleoseismic investigation using Lidar revealed that more than 5 meters (16 ft) of slip has accumulated since the 1857 event on the southern SAF, which borders the Mojave Desert to the north and east of the Greater Los Angeles Area . Near the Transverse Ranges, reverse and thrust faults have produced damaging earthquakes in Santa Barbara and the San Fernando Valley . </P> <Table> <Tr> <Th> Date </Th> <Th> Area </Th> <Th> Mag . </Th> <Th> MMI </Th> <Th> Deaths </Th> <Th> Injuries </Th> <Th> Total damage / notes </Th> <Th> </Th> </Tr> <Tr> <Td> 2014 - 08 - 24 </Td> <Td> North Bay </Td> <Td> 6.0 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> ~ 200 </Td> <Td> $362 million--$1 billion </Td> <Td> </Td> </Tr> <Tr> <Td> 2014 - 03 - 28 </Td> <Td> Los Angeles Area </Td> <Td> 5.1 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> Few </Td> <Td> $10.8 million </Td> <Td> </Td> </Tr> <Tr> <Td> 2013 - 05 - 13 </Td> <Td> Eastern </Td> <Td> 5.7 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Damage at Canyondam </Td> <Td> </Td> </Tr> <Tr> <Td> 2010 - 04 - 04 </Td> <Td> Baja California </Td> <Td> 7.2 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> 2--4 </Td> <Td> 100--233 </Td> <Td> $1.15 billion </Td> <Td> </Td> </Tr> <Tr> <Td> 2010 - 01 - 09 </Td> <Td> North Coast </Td> <Td> 6.5 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> 35 </Td> <Td> $21.8--43 million </Td> <Td> </Td> </Tr> <Tr> <Td> 2008 - 07 - 29 </Td> <Td> Los Angeles Area </Td> <Td> 5.5 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> 8 </Td> <Td> Limited </Td> <Td> </Td> </Tr> <Tr> <Td> 2007 - 10 - 30 </Td> <Td> South Bay </Td> <Td> 5.6 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> </Td> <Td> Limited </Td> <Td> </Td> </Tr> <Tr> <Td> 2003 - 12 - 22 </Td> <Td> Central Coast </Td> <Td> 6.6 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> 40 </Td> <Td> $250--300 million </Td> <Td> </Td> </Tr> <Tr> <Td> 2000 - 09 - 03 </Td> <Td> North Bay </Td> <Td> 5.0 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 41 </Td> <Td> $10--50 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1999 - 10 - 16 </Td> <Td> Eastern </Td> <Td> 7.1 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 4--5 </Td> <Td> Limited </Td> <Td> </Td> </Tr> <Tr> <Td> 1994 - 12 - 26 </Td> <Td> North Coast </Td> <Td> 5.5 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> $2.1--5 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1994 - 01 - 17 </Td> <Td> Los Angeles Area </Td> <Td> 6.7 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> 57 </Td> <Td> 8,700 + </Td> <Td> $13--$40 billion </Td> <Td> </Td> </Tr> <Tr> <Td> 1992 - 06 - 28 </Td> <Td> Inland Empire </Td> <Td> 6.5 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> Some </Td> <Td> Moderate / triggered </Td> <Td> </Td> </Tr> <Tr> <Td> 1992 - 06 - 28 </Td> <Td> Inland Empire </Td> <Td> 7.3 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> </Td> <Td> 400 + </Td> <Td> $92 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1992 - 04 - 26 </Td> <Td> North Coast </Td> <Td> 6.6 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Damage / triggered </Td> <Td> </Td> </Tr> <Tr> <Td> 1992 - 04 - 26 </Td> <Td> North Coast </Td> <Td> 6.5 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Damage / triggered </Td> <Td> </Td> </Tr> <Tr> <Td> 1992 - 04 - 25 </Td> <Td> North Coast </Td> <Td> 7.2 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> </Td> <Td> 98--356 </Td> <Td> $48.3--75 million / tsunami </Td> <Td> </Td> </Tr> <Tr> <Td> 1992 - 04 - 22 </Td> <Td> Inland Empire </Td> <Td> 6.3 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 32 </Td> <Td> Light--moderate </Td> <Td> </Td> </Tr> <Tr> <Td> 1991 - 08 - 17 </Td> <Td> North Coast </Td> <Td> 6.2 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> Slight damage / landslides </Td> <Td> </Td> </Tr> <Tr> <Td> 1991 - 06 - 28 </Td> <Td> Los Angeles Area </Td> <Td> 5.6 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 100--107 </Td> <Td> $33.5--40 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1990 - 02 - 28 </Td> <Td> Los Angeles Area </Td> <Td> 5.7 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 30 </Td> <Td> $12.7 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1989 - 10 - 17 </Td> <Td> Santa Cruz Mountains </Td> <Td> 6.9 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> 63 </Td> <Td> 3,757 </Td> <Td> $5.6--6 billion / tsunami </Td> <Td> </Td> </Tr> <Tr> <Td> 1989 - 08 - 08 </Td> <Td> Santa Cruz Mountains </Td> <Td> 5.4 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> Minor </Td> <Td> </Td> </Tr> <Tr> <Td> 1987 - 11 - 24 </Td> <Td> Imperial Valley </Td> <Td> 6.5 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> Triggered </Td> <Td> </Td> </Tr> <Tr> <Td> 1987 - 11 - 23 </Td> <Td> Imperial Valley </Td> <Td> 6.1 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> </Td> <Td> $3 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1987 - 10 - 01 </Td> <Td> Los Angeles Area </Td> <Td> 5.9 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> 8 </Td> <Td> 200 </Td> <Td> $213--358 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1986 - 07 - 21 </Td> <Td> Eastern </Td> <Td> 6.2 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> </Td> <Td> $2.7 million / sequence </Td> <Td> </Td> </Tr> <Tr> <Td> 1986 - 07 - 13 </Td> <Td> South Coast </Td> <Td> 5.8 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> </Td> <Td> $700,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 1986 - 07 - 08 </Td> <Td> Inland Empire </Td> <Td> 6.0 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 29--40 </Td> <Td> $4.5--6 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1986 - 03 - 31 </Td> <Td> South Bay </Td> <Td> 5.6 M </Td> <Td> 7000600000000000000 ♠ VI </Td> <Td> </Td> <Td> 6 </Td> <Td> Minor </Td> <Td> </Td> </Tr> <Tr> <Td> 1984 - 04 - 24 </Td> <Td> South Bay </Td> <Td> 6.2 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> 21--27 </Td> <Td> $7.5--8 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1983 - 05 - 02 </Td> <Td> Central Valley </Td> <Td> 6.2 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> 94 </Td> <Td> $10 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1981 - 04 - 26 </Td> <Td> Imperial Valley </Td> <Td> 5.9 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> $1--3 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1980 - 11 - 08 </Td> <Td> North Coast </Td> <Td> 7.3 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 6 </Td> <Td> $2--2.75 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1980 - 05 - 25 </Td> <Td> Eastern </Td> <Td> 6.2 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 9 </Td> <Td> $1.5 million / swarm </Td> <Td> </Td> </Tr> <Tr> <Td> 1980 - 01 - 26 </Td> <Td> East Bay </Td> <Td> 5.4 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> Doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1980 - 01 - 24 </Td> <Td> East Bay </Td> <Td> 5.8 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> $11.5 million / doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1979 - 10 - 15 </Td> <Td> Imperial Valley </Td> <Td> 6.4 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> </Td> <Td> 91 </Td> <Td> $30 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1979 - 08 - 06 </Td> <Td> South Bay </Td> <Td> 5.7 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 16 </Td> <Td> $500,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 1978 - 08 - 13 </Td> <Td> Central Coast </Td> <Td> 5.8 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 65 </Td> <Td> $12 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1975 - 08 - 01 </Td> <Td> Butte County </Td> <Td> 5.7 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> 10 </Td> <Td> $3 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1973 - 02 - 21 </Td> <Td> South Coast </Td> <Td> 5.8 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> Several </Td> <Td> $1 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1971 - 02 - 09 </Td> <Td> Los Angeles Area </Td> <Td> 6.5--6.7 M </Td> <Td> 7001110000000000000 ♠ XI </Td> <Td> 58--65 </Td> <Td> 200--2,000 </Td> <Td> $505--553 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1969 - 10 - 01 </Td> <Td> North Bay </Td> <Td> 5.7 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1969 - 10 - 01 </Td> <Td> North Bay </Td> <Td> 5.6 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> $8.35 million / doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1968 - 04 - 08 </Td> <Td> Imperial Valley </Td> <Td> 6.5 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> </Td> <Td> Damage / rockslides </Td> <Td> </Td> </Tr> <Tr> <Td> 1957 - 03 - 22 </Td> <Td> Bay Area </Td> <Td> 5.7 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> 40 </Td> <Td> $1 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1954 - 12 - 21 </Td> <Td> North Coast </Td> <Td> 6.5 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> Several </Td> <Td> $2.1 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1952 - 08 - 22 </Td> <Td> Central Valley </Td> <Td> 5.8 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> Several </Td> <Td> $10 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1952 - 07 - 21 </Td> <Td> Central Valley </Td> <Td> 7.3 M </Td> <Td> 7001110000000000000 ♠ XI </Td> <Td> 12 </Td> <Td> Hundreds </Td> <Td> $60 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1948 - 12 - 04 </Td> <Td> Inland Empire </Td> <Td> 6.4 M </Td> <Td> 7000700000000000000 ♠ VII </Td> <Td> </Td> <Td> Several </Td> <Td> Minor </Td> <Td> </Td> </Tr> <Tr> <Td> 1941 - 11 - 14 </Td> <Td> Los Angeles Area </Td> <Td> 5.4 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> $1.1 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1941 - 06 - 30 </Td> <Td> Central Coast </Td> <Td> 5.9 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> $100,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 1940 - 05 - 18 </Td> <Td> Imperial Valley </Td> <Td> 6.9 M </Td> <Td> 7001100000000000000 ♠ X </Td> <Td> 9 </Td> <Td> 20 </Td> <Td> $6 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1933 - 03 - 10 </Td> <Td> South Coast </Td> <Td> 6.4 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> 115--120 </Td> <Td> </Td> <Td> $40 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1932 - 06 - 06 </Td> <Td> North Coast </Td> <Td> 6.4 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Severe </Td> <Td> </Td> </Tr> <Tr> <Td> 1927 - 11 - 04 </Td> <Td> Central Coast </Td> <Td> 7.3 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Moderate / tsunami </Td> <Td> </Td> </Tr> <Tr> <Td> 1925 - 06 - 29 </Td> <Td> Central Coast </Td> <Td> 6.8 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> 13 </Td> <Td> </Td> <Td> $8 million </Td> <Td> </Td> </Tr> <Tr> <Td> 1923 - 01 - 22 </Td> <Td> North Coast </Td> <Td> 7.2 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Severe / tsunami </Td> <Td> </Td> </Tr> <Tr> <Td> 1920 - 06 - 21 </Td> <Td> Los Angeles Area </Td> <Td> 4.9 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> More than $100,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 1918 - 04 - 21 </Td> <Td> Inland Empire </Td> <Td> 6.7 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> </Td> <Td> Several </Td> <Td> $200,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 1915 - 06 - 22 </Td> <Td> Imperial Valley </Td> <Td> 5.5 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Additional damage / doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1915 - 06 - 22 </Td> <Td> Imperial Valley </Td> <Td> 5.5 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> 6 </Td> <Td> </Td> <Td> $900,000 / doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1911 - 07 - 01 </Td> <Td> South Bay </Td> <Td> 6.6 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Damage at Lick Observatory </Td> <Td> </Td> </Tr> <Tr> <Td> 1906 - 04 - 18 </Td> <Td> Imperial Valley </Td> <Td> 6.3 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Damage / triggered </Td> <Td> </Td> </Tr> <Tr> <Td> 1906 - 04 - 18 </Td> <Td> Northern--Central </Td> <Td> 7.8 M </Td> <Td> 7001110000000000000 ♠ XI </Td> <Td> 700--3,000 + </Td> <Td> </Td> <Td> Conflagration / tsunami </Td> <Td> </Td> </Tr> <Tr> <Td> 1899 - 12 - 25 </Td> <Td> Inland Empire </Td> <Td> 6.7 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> 6 </Td> <Td> </Td> <Td> $50,000 or more </Td> <Td> </Td> </Tr> <Tr> <Td> 1898 - 03 - 30 </Td> <Td> North Bay </Td> <Td> 5.8--6.4 M </Td> <Td> 7000850000000000000 ♠ VIII--IX </Td> <Td> </Td> <Td> </Td> <Td> $350,000 / moderate </Td> <Td> </Td> </Tr> <Tr> <Td> 1892 - 04 - 21 </Td> <Td> Central Valley </Td> <Td> 6.2 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> </Td> <Td> </Td> <Td> Doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1892 - 04 - 19 </Td> <Td> North Bay </Td> <Td> 6.4 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> </Td> <Td> </Td> <Td> $225,000--250,000 / doublet </Td> <Td> </Td> </Tr> <Tr> <Td> 1892 - 02 - 23 </Td> <Td> Baja California </Td> <Td> 7.1--7.2 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Moderate </Td> <Td> </Td> </Tr> <Tr> <Td> 1873 - 11 - 23 </Td> <Td> North Coast </Td> <Td> 6.7 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Damage / ground cracks </Td> <Td> </Td> </Tr> <Tr> <Td> 1872 - 03 - 26 </Td> <Td> Eastern </Td> <Td> 7.4--7.9 M </Td> <Td> 7001100000000000000 ♠ X </Td> <Td> 27 </Td> <Td> 56 </Td> <Td> $250,000 / limited </Td> <Td> </Td> </Tr> <Tr> <Td> 1868 - 10 - 21 </Td> <Td> Bay Area </Td> <Td> 6.3--6.7 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> 30 </Td> <Td> </Td> <Td> $350,000 / moderate </Td> <Td> </Td> </Tr> <Tr> <Td> 1865 - 10 - 08 </Td> <Td> Santa Cruz Mountains </Td> <Td> 6.3 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> $500,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 1857 - 01 - 09 </Td> <Td> Central--Southern </Td> <Td> 7.9 M </Td> <Td> 7000900000000000000 ♠ IX </Td> <Td> </Td> <Td> </Td> <Td> Severe </Td> <Td> </Td> </Tr> <Tr> <Td> 1838 -?? - 06 </Td> <Td> Bay Area </Td> <Td> 6.8--7.2 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Minor </Td> <Td> </Td> </Tr> <Tr> <Td> 1812 - 12 - 21 </Td> <Td> Central Coast </Td> <Td> 7.1 M </Td> <Td> 7000800000000000000 ♠ VIII </Td> <Td> </Td> <Td> </Td> <Td> Tsunami </Td> <Td> </Td> </Tr> <Tr> <Td> 1812 - 12 - 08 </Td> <Td> South Coast </Td> <Td> 6.9--7.5 </Td> <Td> 7000800000000000000 ♠ VII--IX </Td> <Td> 40 </Td> <Td> </Td> <Td> Moderate </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="8"> Stover & Coffman 1993 uses various seismic scales . M is a local magnitude that is equivalent to M (Richter magnitude scale) and is used for events that occurred prior to the instrumental period . It is based on the area of perceptibility (as presented on isoseismal maps). M = moment magnitude scale and M = surface wave magnitude . The inclusion criteria for adding events are based on WikiProject Earthquakes' notability guideline that was developed for stand alone articles . The principles described are also applicable to lists . In summary, only damaging, injurious, or deadly events should be recorded . </Td> </Tr> </Table> <Tr> <Th> Date </Th> <Th> Area </Th> <Th> Mag . </Th> <Th> MMI </Th> <Th> Deaths </Th> <Th> Injuries </Th> <Th> Total damage / notes </Th> <Th> </Th> </Tr>

What was the strongest earthquake ever recorded in california
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