Seismic and inter-seismic ground surface deformations of the murono mud volcano (Central Japan): A laser scanning approach

Yuichi S. Hayakawa, Shigekazu Kusumoto, Nobuhisa Matsuta

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A small mud volcano in Murono, Niigata Prefecture, north-central Japan, shows active ground surface displacements, not only when large earthquakes occur in the region but also during quiescent periods between earthquake events. The site recently underwent abrupt deformations due to strong regional earthquakes in 2004, 2007, 2011, and 2014, while gradual surface deformations were reported during quiescent periods between the earthquakes. To detect the spatial distribution of the changes in the mud volcano’s ground surface elevation, we carried out multi-temporal terrestrial laser scanning. Point cloud datasets were registered at different times by minimizing the distance between the closest points in different clouds for stable ground features, which revealed centimeter-to decimeter-scale deformations around the domain of the conspicuous uplift. The spatial distribution of the deformation triggered by the earthquakes, including both central uplift and peripheral subsidence, exhibits an elliptical pattern, on which open crack fractures, associated with the earthquake-triggered uplift, were formed. The displacement and stress fields for the earthquakes were modeled numerically, and anomalously high pressure and/or weakening of the surficial materials was expected for the formation of fractures in the local domain. In contrast, continuous uplift was observed during the inter-seismic quiescent periods, the domain of which seems to have changed after the strong earthquake in 2014. In the coming years, further measurements will be necessary to unravel the physical subsurface mechanics of the mud volcano.

Original languageEnglish
Article number3
JournalProgress in Earth and Planetary Science
Volume4
Issue number1
DOIs
Publication statusPublished - Jan 1 2017

Keywords

  • Cracks
  • Digital elevation model
  • Mud volcano
  • Point cloud
  • Terrestrial laser scanning

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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