Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.g33a0051z&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #G33A-0051
Physics
1221 Lunar And Planetary Geodesy And Gravity (5417, 5450, 5714, 5744, 6019
Scientific paper
It is very important to analyze the seismic sequence as for earthquake prediction research. The large earthquakes may occur when tide triggers foreshocks in some region, which indicates that earthquakes preparation zone come into a critical state. The stress in epicenter zone lies on high or low level can be determined based on relationship between tidal triggering effect and the aftershocks. This paper discussed the triggered seismicity of tidal force and additional tidal stress. 17 seismic sequences (>Ms 7.0) in China mainland since 1970 were selected to analyze the distribution characteristic of azimuths of tidal force at time of earthquakes. According to focal mechanism of 9 lager earthquakes in China from 1966 to 1976, tidal normal stress/shear stress in fault slip orientation and their change rates were calculated, and relationship between earthquakes and tidal triggering effect was showed in this paper. The result is proved that: 1. The tidal force had an advantage azimuth range at the time of foreshocks, main shock and aftershocks in certain period and zone. The azimuth range of horizontal tidal force at the time of triggered earthquakes was only 35% of total azimuth ranges in the chosen period. 2. The period of triggering may be a few days - a few months, but has no evidence to be correlative with magnitude. For some complex structure areas, there may be more than one advantage azimuth ranges. The magnitudes of triggered shocks are different (about 4-5), which may be correlative with background of fault stress, or with mechanism and medium in epicenter region, and not with magnitude of main shock. 3. Large earthquakes are determined by change of fault stress field, the dynamic tidal stress in fault slip orientation is probably triggered of great strike-slip earthquake. The triggering of large earthquakes and seismic sequences in different region showed that the triggering mechanisms of different seismic sequences are not the same due to different seismic mechanism, different structure condition and different medium characteristic. Commonness of tidal triggering of seismicity should be carefully studied because of complicated structure condition. Triggering mechanisms of seismic sequences need to be further more studied certainly.
Yang Lantian
Zhang James J.
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