Detection of magma bodies beneath Krakatau Volcano (Indonesia) from anomalous shear waves

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doi: 10.1016/0377-0273(89)90097-8
Authors:Harjono, Hery; Diament, Michel; Nouaili, Lassaad; Dubois, Jacques
Author Affiliations:Primary:
Univ. Paris Sud., Lab. Geophys., Orsay, France
Volume Title:Journal of Volcanology and Geothermal Research
Source:Journal of Volcanology and Geothermal Research, 39(4), p.335-348. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-0273
Publication Date:1989
Note:In English. 38 refs.; illus. incl. 2 tables, sects., geol. sketch maps
Summary:The seismograms of 14 local earthquakes recorded in the Sunda Strait were used to construct an image of shear-wave attenuating bodies near Krakatau. Seismograms for all ray paths going beneath the complex show a diminution of the S wave amplitude which cannot be attributed to source mechanism or station effects. Combination of all ray paths shows that the attenuating body is located in two zones which are probably disconnected. The upper zone is approx 9 km deep and the lower at least 22 km deep. The upper zone probably contains numerous irregular pockets of magma, while the deep zone appears to be a very wide body related to the extensional nature of the area. The existence of a large, deep reservoir should be taken into account for the mitigation of future hazards. [R.E.S.]
Subjects:Body waves; Elastic waves; Genesis; Geophysical methods; Geophysical surveys; Magmas; Petrology; S-waves; Seismic methods; Seismic waves; Surveys; Volcanism; Volcanoes; Volcanology; Asia; Far East; Indonesia; Krakatoa; Sundra Strait
Abstract Numbers:90M/3549
Record ID:1990038125
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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