抄録
Strain seismograms from near earthquakes observed at the Erimo Geophysical Observatory are analyzed. Wave forms of these strain seismograms from P arrival to S arrival are relatively simple. Theoretical strain seismograms from the double-couple point source are calculated and are compared with the observed strain seismograms. A good agreement between the observed and the theoretical strain seismograms from P arrival to S arrival is obtained. Seismic moment and effective rise time of the moment rate function are estimated. It is demonstrated that the strain meter is very useful to record the slow deformation such as the Kurile islands tsunami earthquake of June 10, 1975.
