Spatial variations in the frequency-magnitude distribution of earthquakes at Soufriere Hills Volcano, Montserrat, West Indies

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dc.contributor The University of the West Indies
dc.creator Power, John A. "et al."
dc.date 1998
dc.date.accessioned 2018-03-14T14:13:48Z
dc.date.available 2018-03-14T14:13:48Z
dc.identifier.uri http://hdl.handle.net/2139/45478
dc.description The frequency-magnitude distribution of earthquakes measured by the b-value is determined as a function of space beneath Soufriere Hills Volcano, Montserrat, from data recorded between August 1, 1995 and March 31, 1996. A volume of anomalously high b-values (b > 3.0) with a 1.5 km radius is imaged at depths of 0 and 1.5 km beneath English's Crater and Chance's Peak. This high b-value anomaly extends southwest to Gage's Soufriere. At depths greater than 2.5 km volumes of comparatively low b-values (b∼1) are found beneath St. George's Hill, Windy Hill, and below 2.5 km depth and to the south of English's Crater. We speculate the depth of high b-value anomalies under volcanoes may be a function of silica content, modified by some additional factors, with the most siliceous having these volumes that are highly fractured or contain high pore pressure at the shallowest depths.
dc.source Geophysical Research Letters, Vol. 25, No. 19, 3653-3656
dc.subject Earthquakes
dc.subject Soufriere Hills Volcano
dc.subject Frequency magnitude
dc.subject b-values
dc.title Spatial variations in the frequency-magnitude distribution of earthquakes at Soufriere Hills Volcano, Montserrat, West Indies


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