ACADSTAFF UGM
| Title | : | The 26 May 2006 magnitude 6.4 Yogyakarta earthquake south of Mt. Merapi volcano: Did lahar deposits amplify ground shaking and thus lead to the disaster?, G-cubed: |
| Author | : |
Prof. Dr. Kirbani Sri Brotopuspito (1) Dr.rer.nat. Ade Anggraini, S.Si., M.Si. (2) |
| Date | : | 2008 |
| Keyword | : | Yogyakarta earthquake, lahar,site effects,soil amplification ,Mt. Merapi Volcano Yogyakarta earthquake, lahar,site effects,soil amplification ,Mt. Merapi Volcano |
| Abstract | : | Indonesia is repeatedly unsettled by severe volcano- and earthquake-related disasters, which aregeologically coupled to the 5–7 cm/a tectonic convergence of the Australian plate beneath the Sunda Plate.On Saturday, 26 May 2006, the southern coast of central Java was struck by an earthquake at 2254 UTC inthe Sultanate Yogyakarta. Although the magnitude reached only Mw= 6.4, it left more than 6,000 fatalitiesand up to 1,000,000 homeless. The main disaster area was south of Mt. Merapi Volcano, located within anarrow topographic and structural depression along the Opak River. The earthquake disaster area withinthe depression is underlain by thick volcaniclastic deposits commonly derived in the form of lahars fromMt. Merapi Volcano, which had a major influence leading to the disaster. In order to more preciselyunderstand this earthquake and its consequences, a 3-month aftershock measurement campaign wasperformed from May to August 2006. We here present the first location results, which suggest that theYogyakarta earthquake occurred at 10–20 km distance east of the disaster area, outside of the topographicdepression. Using simple model calculations taking material heterogeneity into account we illustrate howsoft volcaniclastic deposits may locally amplify ground shaking at distance. As the high degree of observed damage may have been augmented by the seismic response of the volcaniclastic Mt. Merapi deposits, thiswork implies that the volcano had an indirect effect on the level of earthquake destruction. |
| Group of Knowledge | : | Geofisika |
| Original Language | : | English |
| Level | : | Internasional |
| Status | : |
Published
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