Short-wavelength Bouguer gravity anomaly and active fault distribution in the northeastern Japan arc

Mitsuhiro Hirano, Hiroyuki Nagahama, Jun Muto

Research output: Contribution to journalArticlepeer-review

Abstract

In the northeastern (NE) Japan arc, active faults have a characteristic effect upon the short-wavelength Bouguer anomaly (SWBA). Here, we create a SWBA map based on the Fourier analysis of the latest gravity dataset and evaluate the relationship between the SWBA and active faults in the arc. Ultimately, we found that active faults are associated with negative regions or grooves in the SWBA and that the SWBA does not clearly depend on underlying geology in the arc. Accumulated volumetric strain caused by faulting in the crust over the past 3 Ma of geological time has generated these negative gravity anomalies, estimated at around ‒10 mGal at a maximum. Strain concentration zones can have negative zones of gravity anomaly affecting the patterns of the SWBA throughout in the arc, and the SWBA reflects the amount of crustal deformation with the curvature.

Original languageEnglish
JournalTerra Nova
DOIs
Publication statusAccepted/In press - 2021

ASJC Scopus subject areas

  • Geology

Fingerprint

Dive into the research topics of 'Short-wavelength Bouguer gravity anomaly and active fault distribution in the northeastern Japan arc'. Together they form a unique fingerprint.

Cite this