Geomagnetic deep sounding of Java Trench subduction zone

Abstract

Due to the complex tectonic setting of an island are subduction zone. which involves marked changes in temperature and lithologies at depth, one might expect subduction zones to be associated with significant geomagnetic deep sounding (GDS) anomalies. This is the case in Japan and in Peru. In both cases the heat rlslng above the descending slab and the resistive upper part of the slab have been suggested as possible causes for the observed anomalies. Jones et al. (1981) showed that the temperature distribution could be significanat, and presented the GDS anomaly for three different thermal models.