PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

TSUNAMI INUNDATION MODELING
PELABUHANRATU, WEST JAVA

Yudhicara
Center for Volcanology and Geological Hazard Mitigation
ABSTRACT

According to its coastal characteristic, Pelabuhanratu and its surroundings is divided into 4 (four) types, they are : (1) sandy beaches, (2) gravely sandy beaches, (3) rocky beaches and (4) corral reef beaches. In general coastal area of Pelabuhanratu has bay shape and pocket beaches. Has low-steep morphology, flat area has 6.5 km at Ciletuh Bay and maximum ~ 9 km at Pelabuhanratu bay. Beach slope 2o to 10^o. Height difference of low land from sea level is about 1 to 6 meter. Horizontal distance to the nearest building 40 - 175 meter.

Using ComMIT (2007), we tried to model tsunami inundation. We used two scenarios. Scenario 1 has source model perpendicular to Pelabuhanratu. We were using three sub-faults from Sunda subduction zone which has earthquake rupture length 300 km and 50 km width, magnitude as Mw 9.0, distributed slip 59.14 meters, which has fix depth (~10 km), dip (~25^o) and rake angle (90^o). The result has maximum flow depth about 10 meters near to the shore and maximum inundation about 6.48 km from the shoreline.

Scenario 2, has source model not perpendicular to the site but earthquake parameter is the same. The result has maximum flow depth about 6 meters and maximum inundation about 3.24 km.

Keywords: Tsunami inundation model, earthquake sources, coastal characteristics