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Journal Article

Mid mantle scatterers near the Mariana slab detected with a double array method

Authors

Krüger,  F.
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Baumann,  Martin
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Scherbaum,  F.
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Weber,  Michael
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Krüger, F., Baumann, M., Scherbaum, F., Weber, M. (2001): Mid mantle scatterers near the Mariana slab detected with a double array method. - Geophysical Research Letters, 28, 4, 667-670.


https://gfzpublic.gfz-potsdam.de/pubman/item/item_227977
Abstract
We use a cluster of deep earthquakes, the fore- and aftershocks of the 23-AUG-1995 Mw=7.1 (18.8N, 145.3E, h=595 km) event in the Mariana subduction zone as source array to locate where waves scatter near the deep slab. In order to obtain the high-precision location needed in this context, we first relocate the events with a modified master event technique. Using the double beam method on the relocated events and data from the Warramunga array in Australia, we identified two non-standard S-to-P conversions arriving about 20.5 and 24 s after the P-wave. The corresponding scatterers are approximately located at a depth of 790 km (720 km) and a distance of 0.9° to the southeast (2.3° to the southwest) of the main shock. The scatterers positions correspond to the location of lithosphere subducted below the 660 km discontinuity.