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《Chinese Journal of Sinica》 1975-03
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THE FOCAL MECHANISM OF THE 1966 HSINGTAI(邢台) EARTHQUAKE AS INFERRED FROM THE GROUND DEFORMATION OBSERVATIONS

CHEN YUN-TAI LIN BANG-HUI LIN ZHONG-YANG LI ZHI-YONG(Institute of Geophysics, Academia Sinica)  
In this paper, analytical expressions for the earthquake displacement field pro-duced by rectangular strike-slip and dip-slip faults of arbitrary dip in a semi-infinite elastic medium for the case of unequal Lame constants are given in closed forms. Some numerical examples are presented to illustrate the effects of Poisson ratio of the medium, the dip angle, upper and lower boundary of the fault, to earthquake dis-placement field on surface. By comparing the geodetic data of the 1966 Hsingtai earth-quake to the theoretical surface displacements that would be produced by a single rectangular slip fault of various strike, dip direction, dip angle, fault length, width, focal depth, and dislocations, it is shown that the simplified single slip fault model can not explain satisfactorily the observed horizontal and vertical ground deforma-tion. In order to account for the observed data, a compounded fault model which consists of six simple rectangular slip faults, is proposed. By using the grid trial method, the source parameters appropriate to the observed horizontal as well as ver-tical displacement field are obtained. The results are as follows: the upper three simple rectangular slip faults breaking to the surface, have a dip angle of 45°, width 15 km, while the lower three simple rectangular slip faults have a dip angle of 82°, width 30 km. Other source parameters determined are as follows: strike, N35°B; dip direction, N125°E; total fault length, 50 km; average strike-slip dislocations respectively, -78, -134, -17, 2, -3, and 1 cm (minus stands for the right-lateral strike-slip while plus for the left-lateral strike-slip); average dip-slip dislocations respectively, 2, 50, 88, 24, -5, and -23 cm (minus stands for the reverse fault while plus for the normal fault); seismic moments respectively, 3.2, 5.9, 3.7, 2.0, 0.5, and 1.9 X 1025 dyne · cm, stress drops respectively, 22, 42, 33, 5, 1, and 4 bars, strain drops respectively, 3.3, 6.4, 5.0, 0.8, 0.2, and 0.6 X 10-5. Lower limit of strain energy release is 6.1 X 1022 ergs. A comparison of the obtained results with the epicentral distri-bution of earthquakes of magnitudes greater than 6 indicates that, the main shock and two larger foreshocks are related more closely with the dislocation of the upper three portions of this compounded fault, and that the two larger aftershocks are related with the dislocation near the ends of the lower portions of this compounded fault. Results of leveling survey in Hsingtai area since 1920, indicate that the upper limit of the rate of subsidence is about 5 mm/yr. If the strain accumulated in this area is as-sumed to be released entirely by the 1966 Hsingtai earthquake, the lower limit of the recurrence period of earthquakes of magnitudes as high as the 1966 Hsingtai earth-quake can be estimated in terms of the average dip-slip dislocation of this compound-ed fault to be about 176 years.
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