Table 1. Fault parameters for computation of tsunami modeling. Strike. Dip. Rake ( ) ( ) ( )

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1 QUICK FORECASTING OF TSUNAMI IN BALI AND NUSA TENGGARA REGIONS, BASED ON THE TSUNAMI DATABASE SYSTEM By TITI HANDAYANI (Tsunami Course, 2008) Meteorological, Climatological and Geophysical Agency (BMKG), Jakarta, Indonesia 1. Fault Parameters of Tsunami Sources Table 1. Fault parameters for computation of tsunami modeling. Mag (M) Depth of Center Fault (km) Depth of Right Bottom Corner of Fault (km) Strike ( ) Dip ( ) Rake ( ) Length (L) (km) Width (W) (km) Slip (D) (m) Remark: Depth of right bottom corner of fault had negative values which were forced to be zero. 1

2 Figure 1. Deformation area of source point C with magnitude 8.0, depth of 0 km. The red contours show uplift area with contour interval of 0.1 m, blue contours show subsidence area with contour interval of 0.05 m, and yellow rectangle is the fault projection to surface. 2. Source Points, Coastal Points and Forecast Points Figure 2. Yellow star denotes real case of the 1977 Sumbawa earthquake (Mw 8.3). Red circles denote 21 source points, rectangles denote 19 coastal blocks, red triangles denote coastal points and green circles denote forecast points. 2

3 Table 2. Location of the 21 source points. Source Point Longitude ( E) Latitude ( S) A B C D E F G H I J K L M N O P Q R S T U

4 Figure 3. The location and focal mechanism of the 1977 Sumbawa earthquake (Mw 8.3) from the Global (Harvard) CMT catalog. The mechanism indicates normal fault. Rectangles denote small coastal blocks. 4

5 Table 3-1. Location of coastal points and forecast points using finer mesh. Coastal Point Coastal Coastal Points Forecast Points (Location Point Long Lat Depth Long Lat Depth Name) Symbol ( E) ( S) (m) ( E) ( S) (m) Airsatang CP Antasari CP Klatingunging CP Kuta CP Pecatu CP Benoa CP Sanur CP Nusa Penida CP Pelangang CP Blongas CP Mangkung CP Bumbang CP Awang CP Sunut CP Rambang CP Sejorong CP Garantah CP Plampang CP Boalloka CP Doromata CP Gerampi CP continued 5

6 Coastal Point Coastal Coastal Points Forecast Points (Location Point Long Lat Depth Long Lat Depth Name) Symbol ( E) ( S) (m) ( E) ( S) (m) Komodo CP Tanahdamar CP Watu-ngbong CP Larantuka CP Ubuoleta CP Watukarere CP Praigaga CP Tandulujangga CP Lalindi CP Manukangga CP Lakadale CP Lakahembi CP Yawang CP Mondu CP Larawali CP Weetebula CP Manukalada CP

7 Table 3-2. Location of coastal points and forecast points using coarse mesh. Coastal Coastal Points Forecast Points Coastal Coastal Point Long Lat Depth Long Lat Depth Point Block (Location Symbol (Prefecture) ( E) ( S) (m) ( E) ( S) (m) Name) Airsatang CP Jembrana Antasari CP Klatingunging CP3 Tabanan Kuta CP Badung Pecatu CP Benoa CP6 Denpasar Sanur CP7 Gianyar Nusa Penida CP8 Klungkung Pelangang CP Lombok Barat Blongas CP Mangkung CP11 Lombok Bumbang CP12 Tengah Awang CP Sunut CP14 Lombok Timur Rambang CP Sejorong CP16 Sumbawa Barat Garantah CP Plampang CP Sumbawa Boalloka CP Doromata CP Gerampi CP21 Bima Komodo CP22 Manggarai Tanahdamar CP23 Barat Watu-ngbong CP24 Manggari Larantuka CP25 Ngada continued 7

8 Coastal Coastal Points Forecast Points Coastal Coastal Point Long Lat Depth Long Lat Depth Point Block (Location Symbol (Prefecture) ( E) ( S) (m) ( E) ( S) (m) Name) Ubuoleta CP Sumba Barat Watukarere CP Praigaga CP Tandulujangga CP Lalindi CP30 Sumba Timur Manukangga CP Lakadale CP Lakahembi CP Sumba Timur Yawang CP Mondu CP Larawali CP Sumba Barat Weetebula CP Manukalada CP

9 3. Results (Tsunami Height) Figure 4. Comparison of tsunami heights by using finer mesh and coarse mesh. Remark of the graphic: Tsunami heights using coarse mesh (1850 m) with Green s law Tsunami heights at forecast points using coarse mesh (1850 m) Tsunami heights at coastal points using coarse mesh (1850 m) Mean at the coast using coarse mesh (1850 m) Median at the coast using coarse mesh (1850 m) The range of minimum and maximum tsunami heights at the coast using coarse mesh (1850 m) Tsunami heights at coastal points using finer mesh ( m) Mean at the coast using finer mesh ( m) Median at the coast using finer mesh ( m) The range of minimum and maximum tsunami heights at the coast using finer mesh ( m) 9

10 Figure 5. Tsunami heights at coastal points according to different magnitudes and depths. Figure 6. Tsunami heights of Green s law calculation at coastal points. 10

11 4. Conditions for Computation Tabe 4. Region for computation and data used for simulation. Area 113.0º E-122.5º E / 7.5º S ºS Bathymetry data 1 arc-minute GEBCO t 3.0s 11

QUICK FORECASTING OF TSUNAMI IN BALI AND NUSA TENGGARA REGIONS, BASED ON THE TSUNAMI DATABASE SYSTEM

QUICK FORECASTING OF TSUNAMI IN BALI AND NUSA TENGGARA REGIONS, BASED ON THE TSUNAMI DATABASE SYSTEM Titi HANDAYANI MEE0874 Supervisor: Yushiro FUJII ABSTRACT Tsunami database in Bali and Nusa Tenggara