碩士 / 國立臺灣海洋大學 / 應用地球科學研究所 / 100 / The extremely destructive earthquake M = 9.3 in December 26 2004 and by the resulting tsunami in north Sumatra, Indonesia was the worst natural disaster in recorded human history (more than 270.000 peoples died). However, the tsunami earthquakes continue to strike the west coast of Sumatra up to present day. There were at least 12 events, the earthquake magnitude between M = 7 to 8.9. In 2010, after 6 years of the 2004 event, an earthquake of a magnitude 7.8 resulted a destructive tsunami was also happened near Mentawai Island at West coast of West Sumatra Province (more than 3.000 peoples died). Here we present local earthquake data from local seismic network along the Sumatra region that provided by the Meteorology Climatology Geophysical Agencies of Indonesia (MCGAI). The data processing was started with building a minimum one-dimension P-wave velocity model with VELEST, by using joint inversion of picked P-wave travel time; then we determined the correction of the initial hypocenter provided by MCGAI, in additional we also compare the hypocenter correction by VELEST and relocation by HypoDD. To observe the spatial overview of the historical seismicity along the Sumatra subduction zone, we compare with the IRIS-NEIC PDE catalogue between 2004 and 2010. The main result shows that there is a possible of seismic gap in the border of central – southern domain of Sumatra region. This region included in the central region of Sumatra near Batu and Siberut Islands. The historical earthquake along the Sumatra trench since 17th century showed that the last big rapture in this border of central – southern domain was occurred in 1797 by the magnitude of 8.8. Regarding to the locked patches, the area below Batu Island was less coupled proposed as the result of the subducted Investigator Fracture Zone (IFZ), meanwhile the area below Siberut Island is highly coupled and is in an advance stage of seismic cycle. In particular, most of the events were happened in the northern domain and southern domain, meanwhile in central domain there were less. In this case we propose this seismic gap as a threat possible for the next big rupture and tsunami. This research is just a start for aiming to gain a better understanding of the seismogenic zone. In the future, we will also compare with that of the Taiwan/Japan/Chile subduction zones, so that the analyses can be tested in the world – wide. It is hope to reduce the human‘s pain in the destructive earthquake and tsunami.
| Identifer | oai:union.ndltd.org:TW/100NTOU5135009 |
| Date | January 2012 |
| Creators | Haekal Azief Haridhi, 文龍 |
| Contributors | Chao-Shing Lee, 李昭興 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 85 |
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