Self-potential variations associated with ultra-long-period seismic signals at Merapi volcano

Details Self-potential variations associated with ultra-long-period seismic signals at Merapi volcano Self-potential variations associated with ultra-long-period seismic signals at Merapi volcano

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30vsde6b&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 22, pp. SDE 6-1, CiteID 2156, DOI 10.1029/2003GL018272

Physics

Geophysics

10

Exploration Geophysics: Magnetic And Electrical Methods, Seismology: Volcano Seismology (8419), Volcanology: Eruption Monitoring (7280)

Scientific paper

We report about Self-Potential (SP) anomalies registered 150 m from the active lava dome of Merapi Volcano, which are associated with Ultra-Long-Period (ULP) seismic signals (periods >100 s). During a 5-month period of simultaneous SP and seismological measurements, 50 ULP events were detected seismologically. If SP time series corresponding to ULP events are aligned to the onset times of ULP-events and stacked, the resulting traces show anomalous SP with an amplitude of 5-20 mV/km and 40-60 min duration. In contrast, the anomalous signals were not present in ground temperature data nor in SP data recorded ~1 km from the summit. SP anomalies associated with ULP-seismicity might be caused by electro-kinetic effect of fluid flow in subsurface. This result is consistent with the ULP-generation model based on seismological observations and adds new information towards the understanding of ULP-seismicity.

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