[S-SS04] Earthquake prediction and forecast

[SSS04-P04] Relationship between the Moderate Repeating Earthquakes and the Larger-scale Earthquakes on the trench side

*Masayuki Tanaka¹ (1.Meteorological Research Institute)

Keywords:Moderate repeating earthquakes, Large-scale earthquakes, timing

Earthquakes with very similar waveforms (The Moderate Repeating Earthquakes) have been confirmed in various Japanese regions. Most occur at the plate boundaries and are considered to be closely related to regular slippage between plates. Comparing earthquakes of the same magnitude, it is considered that the slip speed between plates is fast when the interval between occurrences is short, and slow when the interval is long. We are tracking the moderate repeating earthquakes that occur repeatedly at almost the same location and have very similar waveforms, using seismic records observed by the Japan Meteorological Agency's velocity-type seismographs and accelerometers. On the other hand, tsunamis and large earthquakes with damage have occurred near the plate boundary. This time, we focused on the timing of occurrence of large-scale earthquakes in areas closer to the trench than where the moderate repeating earthquakes occurred, and investigated the relationship between the moderate repeating earthquakes and large-scale earthquakes.