Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.s54a..07z&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #S54A-07
Other
[7209] Seismology / Earthquake Dynamics
Scientific paper
The Earth is a member of the solar system. The gravitational force origin from the Sun and the Moon, produce a periodical displacement on the Earth. Such phenomenon has attracted a broad interesting both from the astronomers and the geophysicists. Since one century, the scientists have been wondered that the seismic activities may relate with the tight beating of tides whose amplitude is around 1kPa. However, the conclusions are controversial after analysis the correlations between the occurrence of global earthquakes and the tides. In contrast, some other works have indicated the tidal triggering of earthquakes from regional seismic and volcanic activities. In fact, such phenomenon is more frequently observed from the oceanic seismic events. Until recently, the correlation between the dip-slip earthquakes and tides has been reported, but few evidences were found from the strike-slip types. In this study, the correlations between the earthquake occurrence and the tides were investigated using 26,129 global earthquakes selected from the Harvard CMT catalog. Two days time series of cubic tidal stress was computed before and after each earthquake. It included the solid earth tides as well as the ocean loading parts. A tidal phase corresponding to the cubic tidal stress was assigned to each event. Then the distributions of tidal phase were statistically examined by the Schuster's test. Furthermore, I defined a difference zenith angle between the Moon's and the Sun's (γ=Zm-Zs) which was calculated at the epicenter of each event in the mean time a random distributed γ was also generated. The complete catalog was separated into two groups according to real computed and random generated γ: γa (|γ|<=30°) and γt (γ>30° or γ<-30°). Then the hypothesis of tidal triggering of earthquakes was separately tested by the Schuster's test for each group of events (Figure). (1) No correlations were found for the global earthquakes. The evidence of tidal triggering of earthquakes was appeared after the global catalog was separated into two groups according to the computed γ; (2) The triggering effects were not only revealed for the dip-slip earthquakes but also the strike-slip types which suggest that such phenomenon was more likely depending on the γ than the type of ruptures (Table); (3) The mean excess rate of earthquake occurred at the range of γa is 24.5%+-1.2% for four types of ruptures. (a)-(d) real computed γ, (a) All of earthquakes occurred during γa, (b) γt, (c) Declustered seismic events with Mw>=6.0 at the period of γa, (d) γt; (e)-(f) were the same catalog but separated according to the random generated γ. The solid line is the sinusoidal fitting curve of each distribution.
P values of Shuster’s test for dip-slip and strike-slip earthquakes with Mw>=5.5 occurred during γa.
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