Earthquakes series preceding very long period seismic signals, observed during the 2000 Miyakejima volcanic activity

Details Earthquakes series preceding very long period seismic signals, observed during the 2000 Miyakejima volcanic activity Earthquakes series preceding very long period seismic signals, observed during the 2000 Miyakejima volcanic activity

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30h...5k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 8, pp. 5-1, CiteID 1423, DOI 10.1029/2002GL016631

Physics

Geophysics

3

History Of Geophysics: Seismology, History Of Geophysics: Volcanology, Geochemistry, And Petrology, Seismology: Volcano Seismology (8419)

Scientific paper

Unusual earthquakes series were observed one to two hours before a very long-period (VLP) seismic pulse that happened once or twice a day, during the 2000 activity of Miyakejima volcano, Japan. The series on July 11 and 12 have particularly a clear feature. The time intervals of the earthquakes in the series decrease at a constant rate in the manner of geometric progression. The maximum amplitude of each earthquake is initially almost constant, but linearly decreases with time from few minutes before the occurrence of a VLP pulse. Hypocenters of these earthquakes are below the south-western region of the crater, and near the sea level in depth. We interpret these earthquakes series as repetition of a gradual stress accumulation, and release under the variable critical stress level. The critical stress level is first constant, but linearly decreases later.

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