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Ground penetrating radar survey for the Negoro Fault (Median Tectonic Line active fault system), Wakayama Prefecture, Southwest Japan



Ground penetrating radar survey for the Negoro Fault (Median Tectonic Line active fault system), Wakayama Prefecture, Southwest Japan



Proceedings of the Symposium on Geo-Environments 11: 481-486



It is important to get information on the location and shear zone of for mitigation of earthquake disaster. Until now, there is a few work of the GPR method for a big fault, having a wide shear zone. We surveyed the location and shear-zone width of the Median Tectonic Line (MTL) active fault system at four sites in Iwate Town, Wakayama Prefecture, using the GPR antennas of the frequency of 100 MHz and 35 MHz. The following results were obtained from our GPR surveys. (1) The detected anomaly with a weakly reflected signal was found at all sites on the Median Tectonic Line and the Negoro fault. (2) The zone of weak reflection on the GPR profiles can be imaged as the shear zone. (3) Its zone is 10-20 m wide at the sites 2-4 along the Negoro branch fault, while the zone is 63 m wide at the site 1. Judging from zonal features and geological data, these detected anomalies can be interpreted as shear zones of the MTL active fault system. The detected anomaly of the MTL is wider than that of the Negoro fault. Therefore the GPR method is thought to be effective for investigation of a shear zone.

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Accession: 019106085

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