Focal mechanism solution of the Himalayan earthquake of February 14, 1977 |
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| Authors: | A Das Gupta |
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| Abstract: | Through a closely spaced local network of seismic stations in Himachal Pradesh, India, supplemented by worldwide P-wave first-motion data, the source mechanism of the February 14, 1977 earthquake which occurred very close to the Rawalpindi area in Pakistan has been determined. The fault-plane solution as reported earlier for this event by Seeber and Armbruster (1979) showed thrust faulting. The reliability of their solution has been tested using more P-wave first-motion data from near Indian stations within the epicentral distance of 4°–7°, as well as from distant stations. The inclusion of data from these stations completely changed the type of faulting from thrust to normal type. The new solution parameters have been briefly discussed in relation to the local geological faults/thrusts. |
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