geologi laut pak yusuf surachman bumi planet yg dinamis pajak
TRANSCRIPT
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Tafakur, merenungi fakta-fakta ciptaan Allah
Bumi adalah planet yang dinamis
Yusuf S. Djajadihardja
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Sesungguhnya dalam penciptaan langit dan bumi, silih bergantinya malam dan siang, bahtera yang berlayar di laut membawa apa yang
berguna bagi manusia, dan apa yang Allah turunkan dari langit berupa air, lalu dengan air itu Dia hidupkan bumi sesudah mati
(kering)-nya dan Dia sebarkan di bumi itu segala jenis hewan, dan pengisaran angin dan awan yang dikendalikan antara langit dan bumi; sungguh (terdapat) tanda tanda (kebesaran dan kebesaran
Allah) bagi kaum yang memekirkan)
QS. Al-Baqarah : 164
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GLOBAL WARMING
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Al-Quran (Ath-Thur ayat 6)
Dan laut yang di dalam tanahnya ada api (Qs. 52:6)
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Oceanic Crust (Solid)
Upper Mantle (Liquid)
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Model Animasi
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Subduction zone
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Al-Quran (An-Naml ayat 88)
Dan kamu lihat gunung-gunung itu, kamu sangka dia tetap ditempatnya, padahal ia berjalan sebagai jalannya awan.(Begitulah) perbuatan Allah yang membuat dengan kokohtiap-tiap sesuatu; sesungguhnya Allah Maha Mengetahui apa yangkamu kerjakan (Qs. 27:88).
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Air Laut
Sedimen
Kerak Samudera
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Air Laut
Sedimen
Kerak Samudera
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Air Laut
Sedimen
Kerak Samudera
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Air Laut
Sedimen
Kerak Samudera
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Sedimen
Kerak Samudera
Air Laut
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Lab. Geophysics, ITB
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Lab. Geophysics, ITB
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Lab. Geophysics, ITB
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Ashi, J. (1990)
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`A
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Citatah, Jawa Barat
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Karang Sambung
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Location: Pacific Ocean, mid-ocean ridge. Photographer: A. Malahoff
Location: Karang Sambung, Jateng. Photographer: Internet
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Prisma Akresi Meratus
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SEISMIC SURVEY
ORI, 1992
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Streamer
Air gun
SEISMIC SURVEY
Taira, A. (1992)
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GINCO (1999)
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Sumatra subduction
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Aseismic zone
245 km245 km
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A
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A
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R/V BARUNA JAYA IV
January 16 - February 4, 2005
R/V BARUNA JAYA IV
January 16 - February 4, 2005
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Meulaboh
Calang
Lamno
Simeuleu Island
Sabang
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MEULABOH
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MEULABOH
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Naik Turun
Aceh
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Meulaboh
Perumahan Nelayan yang terendam air
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Tanda panah menunjukkan bahwa jalandan sekitarnya mengalami penurunan 1 -2 mdi Meulaboh utara
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Tanda panah menunjukkan bahwa jalan dan sekitarnya mengalami penurunan 1 -2 m di Meulaboh utara
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UPLIFT SUBSIDENCE
Accretionary Prism
Aceh
Sepanjang pantai barat mengalami penurunanDan di daerah prisma akresi (accretionary prism)dasar lautnya mengalami pengangkatan (naik)Antara 6 s/d 10 m)
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International Tsunami Survei Team (2005)
Meulaboh
Calang
Lamno
Simeuleu Island
Sabang
Apa yang terjadi di utara P. Simeulue (tanda panah)
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International Tsunami Survei Team (2005)
Bunker Jepang (1945), sebelum gempa tinggi permukaan laut berada pada tanda panah.Sekarang telah berada di atas permukaan air yang baru pasca gempa dan tsunami.Daerah ini telah mengalami pengangkatan sebesar 1.5 s/d 3 meter.
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Batu karang yang dalam kondisi normal sebelum terjadi gempa hidup dibawah permukaan air,Setelah terjadi gempa terangkat 1.5 s/d 2 meter. Perhatikan lumut hijau (tanda panah)
Menunjukkan titik pasang tertinggi setelah mengalami pengangkatan.
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Tanah yang ditumbuhi rumput telah mengalami penaikan, sehingga daerah tersebut merekah danMembentuk beberapa retakan. Bandingkan dengan anak-anak yang berdiri di sebelah kanan.
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Batu karang segar sudah berada di atas permukaan air laut
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Garis pantai lama
Garis pantai baruSetelah mengalamipengangkatan
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Paleotsunami
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International Tsunami Survei Team (2005)
Tsunami deposit 26 Desember 2004
Endapan Tanah (soil) dalam kurun waktu 97 tahun)
Tsunami deposit 1907
Lokasi di utara P. Simeulue
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Lintasan Kapal
Survei seismikRefleksi
Memasang OceanBottom Seismograph(OBS), alat ini digunakan untukMemonitor gempa susulan
Lokasi penurunan kameraBawah laut untuk memotret topografi dasar laut
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3 Dimensi Dasar Laut Daerah B
Trench slopeTrench slope
JAMSTECJAMSTECJapan Agency for Marine-Earth Science and TechnologyJapan Agency for Marine-Earth Science and Technology
Terlihat bentuk pegunungan serta tebing sisa longsoran bawah laut akibat getaran gempa 26 Desember 2004 (warna biru). Longsoran ini menyisakan tebing selebar 1000 meter dan panjang 50 km, pada kedalaman 500 s/d 3000 meter.
50 Km
1000 meter
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Penurunan ROV Dolphin Pada titik merah, diperoleh gambar longsoran, rekahan, serta kondisi permukaan dasar lautyang berantakan.
Peta penjelajahan ROV Hyper Dolphin
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Terlihat runtuhan material dasar laut yang terendapkan
JAMSTECJAMSTECJapan Agency for Marine-Earth Science and TechnologyJapan Agency for Marine-Earth Science and Technology
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JAMSTECJAMSTECJapan Agency for Marine-Earth Science and TechnologyJapan Agency for Marine-Earth Science and Technology
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JAMSTECJAMSTECJapan Agency for Marine-Earth Science and TechnologyJapan Agency for Marine-Earth Science and Technology
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1797
1833
18611907
1822
1926 (~7)
1984 (6.4(
1935
1987 (6.6)
19211916198419871892
1822
1943190919951952
1926
1942
18931900
193319941908
19901997
1936
19641967
1893
1892 (7.7)
1900
1908
1916
1933 (7.5)
1942 (7.3)
1936 (7.2)
1952 (6.8)
1979 (6.6)
1943 (7.3)
1990 (6.5)
1997 (6.5)
1964 (6.5)
1921 ( >7)
1994 (6.9)
1995 (7.0)
1909 (7.6)
1967 (6.1)
Historical Earthquakes
1797 (8.2)
1833 (8.7 – 9)
1861 (~8.5)
1907
1935 (7.7)
2000 (7.8)
2002 (7.4)
2004 (9.2)
2005 (8.7)
Subduction ZoneSumatran fault
2000
2005
2004
2002
Future subduction earthquakes
???
Dani Hilman N (2005)
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PELAJARAN GEMPA MASA LALU
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Corals tell about how the islands move up and downPenelitian Coral untuk studi Kejadian Gempa dan Deformasi (Danny, 2005)
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Annual lowest tide (“highest level of survival”)
Substrate
Coral head
The coral “instrument”
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18331816
18081797
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Southern part of South Pagai
Danny Hilman N (2005)
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Zona Terkunci
Satish Singh, 2009
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Coupling
McCloskey, 2009
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The SuGAr data (in combination with the coral data) showed the extent of the locked part of the Mentawai patch prior to Sept 2007 .
These data also showed the degree of “coupling” of the megathrust
Kerry Sieh, 2009
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2007Mw 8,4
2007Mw 7,9
2010Mw 7,9
2010Mw 7,2
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Coupling
McClosky, 2009
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Aseismic zone
245 km245 km
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2007 earthquake zone2007 earthquake zone
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2007Mw 8,4
2007Mw 7,9
2009Mw 7,9
2010Mw 7,2
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Statistik Kejadian Gempa Besar
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Coupling
McClosky, 2009
Kalau Segmen ini lepas
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Padang
McCloskey et al EPSL 2008
Preamble: Both magnitude and location of slip control tsunamis
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BPPT JAMSTEC
Potensi Getaran Gempa Menggoncang Jakarta
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BPPT JAMSTEC
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BPPT JAMSTEC
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BPPT JAMSTEC
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BPPT JAMSTEC
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BPPT JAMSTEC
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BPPT JAMSTEC
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?
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Fracture Zone
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Rotasi Sumatra dari GPS (Cecep dkk, 2002)
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1908
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M 8.7
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Apabila bumi digoncangkan dengan goncangan (yang dahsyat)
dan bumi telah mengeluarkan beban beban berat (yang dikandung) nya
dan manusia bertanya: Mengapa bumi (menjadi begini)?
………………..
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Terima
Kasih
Terima Ka
sih
Wassalamualaikum Warrahmatullahi Wabarokatuh
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BPPT JAMSTEC
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PATAHAN DI JAWA BARAT
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Local Date: Friday May 12th, 2006
Local Time: 01:16 AM PDT
Universal Time: 05/12/2006 08:16:56.770 UTC
Magnitude: 5.40 Mb
Latitude: -5.5940
Longitude: 105.3920
Depth: 11 miles (18 km)
Author:
Authoritative: Yes
USGS
Gempa Ujung Kulon 6.4 SRJumat, 16 Oktober 2009
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Terima
Kasih
Terima Ka
sih