Geomorphological Displacement as a Combined Process of Tectonics and Mass-Movement in the 2011 East Japan Earthquake(<Featured Articles>Mega-Earthquake and Geomorphic Hazards)
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The triggered earthquake of M7.0 occurred in the vicinity of Iwaki City on 11^<th> April 2011. It caused co-seismic surface rapture along the pre-existed Idosawa and Yunotake faults and showed normal faulting with slight strike slip sense. However, strike slip senses along those faults are not consistent. That implies converse plunge to the midpoint along the Idosawa fault was causing sag and drag depression. Such phenomena are attributed to a local tensile stress field induced by quick shift of the outer arc of Northeast Japan Arc due to the 2011 East Japan earthquake that occurred on 11^<th> March. The total number of landslides induced by the earthquake is quite small in comparison with other recent epicentral earthquakes of the reverse fault type in Japan. This implies that earthquake power or energy originated from reverse faults are much stronger than that from normal faulting. Displacement along the normal fault trace is composed of gravitational and tectonic components. Consequently downhill displacement on hill slopes caused by normal faults is liable to be overvalued and does not necessarily indicate the earthquake intensity.
- 2012-10-25
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- Geomorphological Displacement as a Combined Process of Tectonics and Mass-Movement in the 2011 East Japan Earthquake(Mega-Earthquake and Geomorphic Hazards)