Niu, J;
Song, TRA;
(2021)
The Response of Repetitive Very-Long-Period Seismic Signals at Aso Volcano to Periodic Loading.
Geophysical Research Letters
, 48
(9)
, Article e2021GL092728. 10.1029/2021GL092728.
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Abstract
Triggering of volcano seismic activity and eruptions by tides, atmosphere pressure, rainfall, and earthquakes have been in constant debate. However, there is limited evidence concerning the triggering of very-long-period signals (VLPs), which are closely linked to volcano conduit dynamics. Persistent and repetitive VLP event beneath the Aso volcano, historically termed long-period tremor (LPT), manifests episodic pressurization and depressurization events in a crack-like shallow conduit. Here we show that LPT activity display no appreciable spectral peaks associated with major diurnal/semidiurnal tidal constituents or barometric pressure. Instead, passing surface waves of ∼0.01 m/s from the 2011 Tohoku earthquake elevated LPT activity and preferentially increased the likelihood of depressurization events. We suggest that the hydrothermal reservoir near the LPT source behaves like a confined (unconfined) aquifer against short-period (long-period) stress. A high stress rate of ∼10^{2} Pa/s is sufficient to enhance the permeability of the conduit plug/wall and preferentially promotes depressurization events.
Type: | Article |
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Title: | The Response of Repetitive Very-Long-Period Seismic Signals at Aso Volcano to Periodic Loading |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1029/2021GL092728 |
Publisher version: | https://doi.org/10.1029/2021GL092728 |
Language: | English |
Additional information: | © 2021 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/10125714 |
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