Masatoshi Miyazawa's Web Page
@Rosalie Peak, Colorado, USA
Research Interests

Remote, Dynamic Triggering of Earthquake and Non-Volcanic Tremor

Study on the triggering of small earthquakes, non-volcanic tremor, and volcanic tremor caused by the passage of seismic waves from distant large earthquakes. Such induced or triggered seismicity is often seen across Japan and these studies provide a better understanding of the mechanisms that cause earthquake and tremor occurrences.
遥か遠くで起きた大地震の地震波が日本列島を通過する時、小規模な地震や非火山性微動、火山性微動が誘発されることがある。どのようにして地震や微動が誘発されるのかを調べる事により、地震発生メカニズムの解明に迫っている。 (東北地方太平洋沖地震の場合)

Waveforms band-pass-filtered at 2-16 Hz (top of each) show triggering of non-volcanic tremor, which was correlated with the large arriving surface waves (lower) in western Shikoku. (modified from Miyazawa, Brodsky and Mori, 2008)

Application of Distributed Acoustic Sensing (DAS) to Seismology

地下に埋設されている光ファイバケーブルそのもののをセンサーとし、新たな地震観測を試みている。例えば50 km長の光ファイバーケーブルを一本使えば、5 m間隔で約1万点もの地震計を配置することと等価である。大規模記録の調査から、新たな地震学の在り方を模索する。

Seismic Hazard Assessment of Great Earthquakes


Application of Seismic Interferometry to Monitoring of Seismic Faults

Seismic Interferometry is a powerful method for retrieving seismic waves propagating between two seismic stations, by using only noise data. The purpose of this work is to find spatio-temporal changes of fault model parameters (e.g., at the Yamasaki Fault and plate interfaces).

The Yamasaki Fault is about 50 km long, strikes WNW--ESE, and consists of five left-lateral fault segments.

Example of exracted P- and S-wave propagations from noise data by using the seismic interferometry. (modified from Miyazawa, Snieder and Venkataraman, 2008)


Other interests include non-volcanic tremor, aftershocks, seismic hazard, seismic wave scattering.
See my publication lists in detail.

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