Physics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39..157a&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 39, Issue 3, p. 157-166.
Physics
3
Scientific paper
The large deep earthquake of January 21, 1906 is re-evaluated using old seismogram data and updated analysis techniques. From the P and pP-P time data the hypocentre parameters are determined as follows: origin time, 13h 49min 35s; latitude, 33.8°N longitude, 137.5°E depth, 340 km. The body-wave magnitude mB is re-evaluated from the amplitude and periods of P, PP and S waves. The average value of 7.4 is obtained. This value is the smallest among any values assigned previously to this shock, and it is denied that the earthquake is the world's largest deep shock in this century. The focal mechanism is estimated from the P-wave first motions and amplitude distribution of P and S waves. Synthetic body waves are used to constrain the mechanism and to determine the seismic moment. The mechanism solution suggests the down-dip compression typical of this region. A seismic moment of 1.5 × 1027 dyn . cm is obtained. This value and the re-evaluated value of mB are consistent with the moment-B relation obtained for other deep earthquakes.
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