Feb 2, 2009

Small earthquakes continued strong earthquake precursory

Irvine intensify in the coming one study showed that across the San Andreas fault in California (San Andreas Fault), the Richter scale occurred in 7 of the main shock for the 137-year cycle, known over the past 200 years short. The southern section of fault has been more than 250 years no more than 7 magnitude earthquake, which contains a powerful energy, could erupt at any time, affect the entire Southern California. 

In recent months, Southern California, small earthquakes continued, located in San Diego Tijuana27 Day 2:12, also occurred in 3.0 Richter scale earthquake. University of Southern California Professor of Earth Sciences Research Center, said Li Yong-gang, with the exception of San Andreas, the Chinese community of peers throughout the Vatican (Puente Hills) fault is also facing cycle. 

He said that the next 25 years, Southern California 99% probability, the occurrence of a considerable scale in 1994, Northridge earthquake of about 6.7, about 60 percent or more chances 7 earthquake. 

The report notes that in Southern California over the past 700 years, the main shock occurred in cycles of about 137 years, with the exception of 1857, the average annual 1310,1393,1585 and 1640 respectively, while the size of 8 major earthquake occurred in cycles, compared to 200 years. 

In the past, seismologists believe that the fault occurred in the main shock over a period of 200 years, now research may occur 137 years, scientists asserted that the coming decades, fault may eventually break out 8 earthquake. 

Li Yonggang, said up to 1,500 kilometers of the San Andreas fault and its northern section in 1905 in San Francisco 7.9 earthquake occurred, but the central fault Tajon Pass in Southern California and the southern section of the host, it has long been a strong earthquake cycle. 

He said, Tajon Pass fault from Central California south Chong, covering Santa Barbara, Ventura, San Fernando and other counties, the paragraph had been in 1857 the size of 8 earthquake has not been 151 years movement, if the increase in accordance with the Irvine study, that the fault occurred in the scale of 7 earthquake has passed the 137-year cycle. 

As for the southern section of San Andreas fault, then along the north side of Highway 210 east through the San Bernardino County, Li Yonggang, said that the fault has been more than 250 years is not a big earthquake, regardless of the size of 7 or 8 earthquake, have been the outbreak of the cycle. 

Li Yonggang, said from Los Angeles to the southeast, along the San Gabriel Valley and south to Highway 5, Anaheim peers Vatican fault, in the past 12,000 years have been more than 6 times 7.5 earthquake so far has been to 2000 cycle. 

He said that peer Vatican fault coverage for the Chinese gathered, including Monterey Park, San Gabriel, Diamond Bar such as, in the event of earthquake, will have an impact on the majority of Chinese. 

Li Yong-gang and said that over the past year and found that these two faults, 2,3 Richter scale occurred around the frequency of small earthquakes frequently than in previous years, including last week's earthquake in San Bernardino, with the epicenter in a few months ago Chino earthquake, so that they are worried about whether the earthquake precursors. 

He said that the Richter scale 7 and 8 degree earthquake despite the shock varies greatly, but all may cause harm to life, especially in the next 25 years 99% chance to occur more than 6.7 magnitude earthquake, while Northridge earthquake was 25 billion yuan loss, so people need to special attention.

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