RELATIONSHIPS AMONG DIFFERENT MAGNITUDES FOR INLAND EARTHQUAKES CLASSIFIED BY FAULT TYPE AND THEIR APPLICATION TO STRONG MOTION PREDICTION

Abstract

We examined how the relationships systematically change among the moment magnitude MW, the Japan Meteorological Agency magnitude MJ, and the short-period magnitude m for inland earthquakes classified by fault type. The examination was extended to the relationships among the magnitudes for inter-plate earthquakes and to those for slab earthquakes. It was found out that MJ was about 0.5 larger than MW in inland earthquakes caused by strike-slip faults, MJ was about 0.2 larger than MW in inland earthquakes caused by dip-slip faults, m was about 0.2 smaller than MW in inland earthquakes caused by strike-slip faults, and m was about 0.1 larger than MW in inland earthquakes caused by dip-slip faults. We applied these relationships to the procedure for evaluating fault parameters, and showed two examples of strong motions predicted for strike-slip and dip-slip faults 40 km long.