Determination of magnitude for large shallow earthquakes 1898-1917

Details Determination of magnitude for large shallow earthquakes 1898-1917 Determination of magnitude for large shallow earthquakes 1898-1917

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...32...45a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 32, Issue 1, p. 45-59.

Physics

21

Scientific paper

In order to arrive at a uniform basis for a study of the global seismicity, the surface-wave magnitude Ms of shallow earthquakes for 1898-1917 is newly determined by using maximum amplitudes of surface waves recorded by undamped Milne and Omori seismographs. The effective gain of these instruments needs to be calibrated with great care, because of the lack of a damping device. The calibration of Milne instruments is based on a comparison of amplitudes measured by Milne instruments with those by more modern, damped instruments. The effective gain varies from 7 to 20 in the range of Ms from 6 to 8.5. The reported amplitudes for the years 1910-1912 are twice as large as the standard, and need to be corrected. By applying these results to a wealth of the Milne data, Ms is determined for a large number of earthquakes between 1898 and 1912. To supplement the data for 1913-1917, records of undamped Omori seismographs are used. For the entire period from 1898 to 1917, 308 shallow earthquakes with Ms >= 7.0 are listed here. Both this list and the previous catalogue of Abe (1981) for 1918-1980 provide a catalogue of large shallow earthquakes much more uniform than any previously established. Between 1899 and 1910 the annual frequency of shocks with Ms >= 7.0 is 20, which is twice as large as the annual average of 10 during 1911 and 1980.

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