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"ABSTRACTGempa bumi yang terjadi pada 17/09/2008 22:04:80 dan 14/11/2008 00:27:31.70 UTC dekat Semangko dianalisis untuk identifikasi bidangpatahannya. Kedua gempa bumi tersebut direlokasi untukmenilai pandangan fisis terhadap ketidakpastian hiposenter.Data yang digunakan untuk menentukan parameter gempa kedua sumber adalah seismogram penuh tiga komponen lokal direkam oleh Geofon IA broadband stasiun jaringan (MDSI, LWLI, BLSI dan RBSI) untuk gempa pada 17/09/2008 dan untuk gempa pada tanggal 14 /11/2008 oleh stasiun jaringan (MDSI, LWLI, BLSI dan KSI). Jarak darisemua stasiun menuju pusat gempa kurang dari 5°. Solusi momen tensor dari kedua gempa dianalisis bersamaan denganpenentuan posisi pusat gaya (centroid)-nya. Analisis simultan meliputi posisi hiposenter, posisi centroid dan bidang nodal dari gempa menunjukkan bidang patahan Semangko. Arah strike dari dua gempa ini sesuai dengan arah Zona Sesar Sumatera. Menimbang bahwa zona sesar Semangko merupakan daerah rawan gempa, identifikasi atas bidang patahan seismik ini penting untuk meneliti bahaya seismik daerah tersebut.

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AbstractThe 17/09/2008 22:04:80 UTC and 14/11/2008 00:27:31.70 earthquakes near Semangko fault were analyzed to identifythe fault planes. The two events were relocated to assess physical insight against the hypocenter uncertainty.The data used to determine source parameters of both earthquakes was three components of local waveform recorded by Geofonbroadband IA network stations, (MDSI, LWLI, BLSI and RBSI) for the event of 17/09/2008 and (MDSI, LWLI, BLSI and KSI) for the event of 14/11/2008. Distance from the epicenter to all station was less than 5°. Moment tensor solution of two events was simultaneously analyzed by determination of the centroid position. Simultaneous analysiscovered hypocenter position, centroid position and nodal planes of two events indicated Semangko fault planes. Considering that the Semangko fault zone is a high seismicity area, the identification of the seismic fault is important for the seismic hazard investigationin the region. "

"Indonesian volcanism is related to the subduction (Benioff) zones of the Indo-Australian and the Pacific-Phillipine plates at the contact with the Asian plate. Rows at volcanoes perpendicular to the plate movement point to steepening of the subduction zone with time. Strato volcanoes and also ignimbrite plateaus associated with socalled “volcano-tectonic” depresssions of deep-seated faults are major features. Fluvio-volcanic flows and slopes are common due to the humid tropical climate. Large volcanic landslides and debris flows causing rupture of crater or caldera rims and the collapse of slopes also are important volcanic geomorphological features. The role of geomorphological survey and the use of aerospace technology in volcanic hazard zoning is emphasized."