The faulting process of Tangshan earthquake inverted simultaneously from the teleseismic waveforms and geodesic deformation data

Details The faulting process of Tangshan earthquake inverted simultaneously from the teleseismic waveforms and geodesic deformation data The faulting process of Tangshan earthquake inverted simultaneously from the teleseismic waveforms and geodesic deformation data

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pepi...66..265x&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 66, Issue 3-4, p. 265-277.

Physics

4

Scientific paper

It is well known that for natural earthquakes the faulting processes are highly complicated. To study such processes, all of the different types of data that can be acquired should be incorporated into the investigations. In accordance with this consideration, the faulting process of the Tangshan earthquake (MS = 7.8) on 27 July 1976 is investigated.
First, the geometrical attitude of the fault is determined by analysing the geological structure, intensity distribution, locations of the aftershocks and geodesic data collectively. Then the faulting process is simultaneously inverted from 14 WWSSN long-period teleseismic waveforms and 70 horizontal geodesic static deformation data. The results show that the Tangshan earthquake is one of the strongest intraplate earthquakes with a complex faulting process. The dimension of the main fracture is approximately 100 km by 15 km with a change in direction at the central part of the fault; the southern segment strikes at about NE30°, becoming 50-60° for the northern segment. The total seismic moment inverted is 2.0 × 1020 Nm and the dislocation was relatively concentrated near the central part of the fault, where the slip elapsed for a longer time. These results suggest that near the city of Tangshan there might be a strong unbroken block and the fault changes its trend there. Hence the fault system was locked before the earthquake. When the regional stress increased and exceeded the strength limit, the fracture initiated from this location and extended bilaterally.

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