Prasetyadi, Carolus (2006) Yogya Earthquake and the Dynamics of Java Trench. In: Proceeding International Interdisciplinary Conference Volcano International Gathering, -, -.
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1.Yogya earthquake and the dynamics of java trench.pdf Download (443kB) | Preview |
Abstract
It has been three months since a tectonic earthquake struck Yogyakarta and its surrounding areas measuring 6.3 on the Richter scale. A question remains, however, on how such devastating earthquake could strike Yogyakarta? Is there any link with the active Merapi volcano? The BPPT (Badan Pengkajian dan Penerapan TeknologilThe Agency for Research and TechonoJgy Application) team has conducted an initial research to address those questions and concluded that the earthquake in Yogya was a result of the release of build-up strain of Opak fault which was the consequence of the pressure from both the Mt. Merapi from the northern side and the subduction zone of India-Austraiian plate in Java trench. The conclusion assumes that ~il. Merapi activities have contributed to the earthquake. but the writer of this paper thinks differently. The presently hijh activity of Merapi and the earthquake have been the result of the Java trench dynamics which led to the movement of India-Australia plate beneath the Java Island, which is part of the Eurasian plate. Seismic activty resulting from subducting plate is normally of a deep nature of >30km. The one that struck Yoyakarta, on the other hand. occurred at a shallow depth of 10 km, which was indicated by the high level of destruction it caused and the emergence of fault or reactivation of ancient fault it has triggered. Unlike Yogyakarta, which does not comprise of any active fault lines, the active Cimandiri and Lembang fault lines in West Java have made the region naturally more prone to earthquake. Questions rema in on the factors contrubuting to the occurence of earthquakes at shallow depth in Yogya instead of in areas with active fault lint"!'. This paper aims at describing the condition and the dynamics of the Java trench that has been considered to originate the earthquake in Yogyakarta. Emphasis will be on the trench of Java, which lies to the north of Central Java and East Java in close proximity with Yogyakarta region, including details on physiography and seismic distribution. Comparison will be made to the Kobe Earthquake 1995 becaues of its similarity with the earthquake: occurence in Yogya, It is expected that this piece of writing will shed some basic light on the principles related to the earthquake in Yogyakarta.
| Item Type: | Conference or Workshop Item (Paper) |
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| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Ir., MT SITI UMIYATUN CHOIRIAH |
| Date Deposited: | 16 Mar 2022 05:06 |
| Last Modified: | 16 Mar 2022 05:09 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/28679 |
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