Cecep Sulaeman
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Karakterisasi sumber gempa Yogyakarta 2006 berdasarkan data GPS Sulaeman, Cecep; Dewi, Lestari Cendekia; Triyoso, Wahyu
Indonesian Journal on Geoscience Vol 3, No 1 (2008)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.776 KB) | DOI: 10.17014/ijog.v3i1.47

Abstract

http://dx.doi.org/10.17014/ijog.vol3no1.20085The southern part of Central Jawa is one of earthquake hazard prone areas in Indonesia an earthquake occurred on May 27, 2006 and had the moment magnitude 6.3. Base on the GPS observation, the characterization of the epicenter and source of this Yogyakarta earthquake can be estimated using the displacement estimation and strain at the measurement point by using a simple kriging and sequential gaussian simulation method. The direction of the displacement and maximum shear strain anomaly in this research was shown by the fault of SW – NE direction and the displacement pattern shows that this fault is left lateral strike slip movement. The positive anomaly of the maximum shear strainis located about 10 km east of Bantul, which suggests as the position of Yogyakarta 2006 earthquake source, with the moment seismic and moment magnitude values are 8.1385 x 1025 dyne cm, and 6.5 respectively.    
METODE MIKROTREMOR UNTUK MIKROZONASI GEMPA BUMI DI KOTA CILACAP Sulaeman, Cecep; Ardi, Nanang Dwi
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Publisher : Program Studi Fisika

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Abstract

Keadaan Kota Cilacap yang berhadapan dengan zona subduksi Jawa di Samudera Hindia, serta adanya patahan Pamanukan-Cilacap menyebabkan adanya potensi gempa bumi yang dapat terjadi kapan saja. Oleh karenanya dibutuhkan upaya mitigasi bencana gempa bumi. Salah satu upaya mitigasi gempa bumi di Kota Cilacap adalah dengan membuat peta mikrozonasi gempa bumi. Pada penelitian ini telah dibuat peta mikrozonasi gempa bumi di Kota Cilacap berdasarkan hasil pengolahan data mikrotremor. Data mikrotremor diukur pada tanggal 29 April 2014 sampai dengan 3 Mei 2014 dengan menggunakan metode pengukuran single station, dan diolah dengan menggunakan metode HVSR. Hasil pengolahan data berupa nilai periode dominan dengan rentang nilai antara 0,28 s - 3,92 s, VS30 dengan rentang nilai antara 30,6 m/s - 430,8 m/s, dan PGA dengan rentang nilai antara 0,00404 g – 0,015139 g. Hasil penelitian ini berupa peta mikrozonasi yang mendeskripsikan zona bahaya bencana gempa bumi di Kota Cilacap. Hasil penelitian ini bermanfaat dalam upaya mitigasi bencana gempa bumi serta dapat digunakan dalam perencanaan dan pengembangan Kota Cilacap.
KARAKTERISTIK TANAH DI KOTA KALABAHI BERDASARKAN NILAI KECEPATAN GELOMBANG SHEAR (Vs) Sulaeman, Cecep
Jurnal Lingkungan dan Bencana Geologi Vol 7, No 1 (2016)
Publisher : Badan Geologi

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ABSTRAKKota Kalabahi terletak di Pulau Alor, Propinsi Nusatenggara Timur, merupakan salah satu daerah rawan gempabumi yangdikontrol oleh dua sumber gempabumi, yaitu lajur tunjaman lempeng Samudra Indo-Australia di sebelah selatan dan sesarnaik Busur Belakang Flores di sebelah utaranya. Pengukuran kecepatan gelombang S (Vs) dengan metode MASW di KotaKalabahi telah dilakukan untuk mengetahui kelas situs tanah dan nilai faktor amplifikasi goncangan gempabumi. PengukuranVs dilakukan pada 54 titik ukur memakai data loger OYO 24 kanal model McSeis 1109, dengan geophone OYOfrekuensi natural 4,5 Hz. Berdasarkan nilai Vs 30, tanah di Kota Kalabahi dapat dibagi menjadi tiga kelas situs: Kelas E(tanah lunak) dengan nilai Vs 30 antara 136 m/det hingga 182 m/det dengan faktor amplifikasi antara 2,76 hingga 3,54,Kelas D (tanah kaku) dengan nilai Vs 30 antara 183 m/det hingga 366 m/det dengan faktor amplifikasi antara 1,52 hingga2,75, dan Kelas C (tanah sangat padat dan batuan lunak) dengan nilai Vs 30 antara 370 m/det hingga 382 m/det denganfaktor amplifikasi antara 1,47 hingga 1,51. Berdasarkan sebaran nilaiVs 30, tanah di Kota Kalabahi didominasi oleh KelasD.Kata kunci : ampilifikasi, kecepatan gelombang S, kelas situs tanahABSTRACTKalabahi Town is located in Alor Island, East Nusatenggara Province. This area is prone to earthquakes due to the existance oftwo seismic sources, Indo-Australia Subduction zone and Flores Back Arc. Multichannel Analysis of Surface Wave (MASW) wasutilized to obtain the (Vs) which was used to classify the site class. A shear wave velocity measurements were carried out at 54sites in Kalabahi town using data loger OYO 24 channel model McSeis 1109, with geophone OYO and natural frequency of4.5 Hz. Based on Vs 30 values, soil in Kalabahi can be classified into three site classes. E Class (soft soil) with (Vs) between 136m/s to 182 m/s and amplification factor between 2.76 to 3.54, D Class (stiff soil) with Vs 30 between 183m/s to 366 m/s andamplification factor between 1.52 to 2.72, and C Class (Very dense soil and soft rock) with Vs 30 between 370 m/s to 382m/s and amplification factor between 1.47 to 1.51. According to the distribution of Vs 30 values, the soil in Kalabahi Town isdominated by D Class Site.Keywords : amplification, shear wave velocity, site class
Identifikasi potensi kerawanan tsunami di wilayah Kabupaten Jember, Jawa Timur Maemunah, Imun; Sulaeman, Cecep; Robiana, Rahayu
Jurnal Lingkungan dan Bencana Geologi Vol 2, No 2 (2011)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3452.869 KB) | DOI: 10.34126/jlbg.v2i2.27

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SARIKarakteristik pantai di Kabupaten Jember dapat dibagi menjadi tiga tipe. Tipe 1 merupakan pantai berteluk yang sempit dengan litologi pasir halus hingga kasar meliputi daerah Payangan, Seruni, Watu Ulo, dan Tanjung Papuma. Tipe 2 merupakan pantai berbentuk lurus dan lebar dengan litologi pasir halus hingga kasar meliputi Pantai Puger dan Paseban. Tipe 3 merupakan pantai berelief curam dan terjal dengan litologi batuan dasar berumur Tersier meliputi daerah Watu Ulo, Tanjung Papuma, Puger, Bandealit, Meru Betiri, Teluk Pisang, dan Teluk Permisan. Secara umum, Tipe 1 merupakan daerah yang berisiko tinggiterhadap bahaya tsunami. Berdasarkan tingkat kerawanan terhadap bahaya tsunami, wilayah pantai di Kabupaten Jember dibagi menjadi tiga kawasan yaitu kawasan rawan tsunami tinggi, kawasan rawan tsunami menengah, dan kawasan rawan tsunami rendah. Kawasan rawan tsunami tinggi merupakan kawasan yangberpotensi terlanda tsunami dengan tinggi genangan mencapai lebih dari 4 m dan jarak landaan maksimal sejauh 365 m dari garis pantai. Kawasan rawan tsunami menengah merupakan kawasan yang berpotensi terlanda tsunami dengan tinggi genangan 1 hingga 3 m, dan jarak landaan mencapai 980 m dari garis pantai, sedangkan kawasan rawan tsunami rendah merupakan kawasan yang berpotensi terlanda tsunami dengan tinggi genangan kurang dari 1 m, dan jarak landaan mencapai 2,7 km dari garis pantai.Kata kunci: karakteristik pantai, tsunami, kawasan rawan tsunami, tinggi genanganABSTRACTCharacteristics of the coastal areas in Jember is divided into three types. Type 1 is a narrow bay coast with fine to coarse sand lithology covering the area of Payangan, Seruni, Watu Ulo, and Tanjung Papuma. Type 2 is a wide and straight coast consists of fine to coarse sand lithology covering the area of Puger beach and Paseban. Type 3 is a steep coast consists of basement rock of Tertiary age covering the area of Watu Ulo, Tanjung Papuma, Puger, Bandealit, Meru Betiri, Pisang bay, and Permisan bay. In general, type 1 is a high risk zone against tsunami hazards. Based on the level of vulnerability to tsunami hazards, the coastal areas in Jember is divided into three zones, namely: high vulnerability zone, moderate vulnerability zone and low vulnerability zone against tsunami hazards. High vulnerability zone is an area potentially affected by tsunami with flow depth of higher than 4 m and the maximum inundation of 365 m from the coast line. Moderate vulnerability zone is an area potentially affected by tsunami with flow depth of about 1 – 3 meters, and the maximum inundation of 980 m at Payangan. Low vulnerability zone is an area potentially affected by tsunami with flow depth of lesser than 1 m and the maximum inundation of 2.7 km from the coast line.Keywords: Coastal characteristic, tsunami, tsunami vulnerability, flow depth
Model intensitas gempa bumi di Maluku Utara Sulaeman, Cecep; Cipta, Athanasius
Jurnal Lingkungan dan Bencana Geologi Vol 3, No 2 (2012)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1271.046 KB) | DOI: 10.34126/jlbg.v3i2.38

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ABSTRAKNilai percepatan tanah di Maluku Utara diperoleh berdasarkan metoda Probabilistic Seismic Hazard Analysis (PSHA) dengan menggunakan perangkat lunak Earthquake Risk Model (EQRM) yang dikembangkan oleh Geoscience Australia. Nilai percepatan tanah selanjutnya dikonversi menjadi intensitas gempa bumi menggunakan persamaan Atkinson dan Kaka. Model sumber gempa bumi yang digunakan sebagai masukan dalam analisis ini adalah zona subduksi Filipina, Thrust Maluku Barat, Thrust Maluku Timur, Sesar mendatar Sorong, Sesar mendatar Sula, dan sesar-sesar yang terdapat di Pulau Morotai, Halmahera, Obi, dan Taliabu. Hasil analisis menunjukkan nilai percepatan tanah di wilayah Maluku Utara berkisar antara 0,07 hingga 1,1 g. Nilai tersebut setara dengan intensitas gempa bumi V MMI hingga IX MMI. Berdasarkan nilai kesetaraan tersebut intensitas gempa bumi di Maluku Utara dapat dibagi menjadi tiga kelompok yaitu, daerah dengan intensitas < VII MMI, VII – VIII MMI, dan intensitas > VIII MMI.Kata kunci: intensitas, percepatan puncak, model sumber gempa bumi, PSHAABSTRACTPeak ground acceleration value in North Maluku was obtained based on Probabilistic Seismic Hazard Analysis (PSHA) method by using a Software for Earthquake Risk Model (EQRM) which is developed by Geoscience Australia. Further ground acceleration value is converted into earthquake intensity by using Atkinson and Kaka Equation. The earthquake sources model which is used as an input in this analysis are Philippines Subduction, West Maluku thrust, East Maluku thrust, Sorong strike slip Fault, Sula strike slip Fault and faults which are located in Morotai, Halmahera, Obi, and Taliabu Islands. Analysis result shows that the Peak ground acceleration values in the North Maluku region range between 0.07 g and 1.1 g. This value is equal with earthquake intensity of MMI V up to MMI IX scale. Based on this equality value, the intensity of earthquake in North Maluku can be divided into three groups, namely region with intensity of < VII of MMI scale, VII –VIII of MMI scale, and the intensity of > VIII of MMI scale.Keywords: intensity, peak ground acceleration, earthquake source, PSHA
Gempa Bumi Bandung 22 Juli 2011 Sulaeman, Cecep; Hidayati, Sri
Jurnal Lingkungan dan Bencana Geologi Vol 2, No 3 (2011)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (633.89 KB) | DOI: 10.34126/jlbg.v2i3.30

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SARIPada tanggal 22 Juli 2011 pukul 05.46 terjadi gempa bumi di kawasan kota Bandung. Getaran gempa bumi tersebut terasa di Bojongkoneng, Ujungberung, dan Pasir Impun, Kota Bandung dengan intensitas II – III MMI. Berdasarkan data dari enam stasiun seismik yang ada di Bandung dan sekitarnya telah ditentukan pusat gempa bumi terletak pada koordinat 107,72° BT dan 6,84°LS dengan kedalaman 6 km, berada pada jarak 12,5 km timur Lembang dan 16 km timurlaut Bandung. Lokasi sumber gempa bumi tersebut berada pada jalur Sesar Lembang. Magnitudo gempa bumi tersebut 3,4 Richter dan memiliki mekanisme fokal dengan pergerakan sesar normal.Kata kunci: gempa bumi Bandung, sesar Lembang, 3,4 RichterABSTRACTA felt earthquake occurred on July 22, 2011 at 05:46 am. It was felt in Bojongkoneng, Ujungberung, and Pasirimpun, Bandung City with intensity II – III MMI. Hypocenter of earthquake was obtained from six seismometers installed around Bandung. The earthquake was originated at 107.72°E and 6.84°S with 6 km deep, 12.5 km east of Lembang and 16 km northeast of Bandung. The earthquake source is located at Lembang fault lines. It has a magnitude of 3.4 Richter and normal fault solution.Keywords: Bandung earthquake, Lembang fault, 3.4 Richter
Tectonic Model of Bali Island Inferred from GPS Data Sulaeman, Cecep; Hidayati, Sri; Omang, Amalfi; Priambodo, Imam Catur
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1743.905 KB) | DOI: 10.17014/ijog.5.1.81-91

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DOI: 10.17014/ijog.5.1.81-91Seven periods of GPS campaign have been conducted for three years since March 2013 - October 2015 on fourteen GPS sites across Bali Island. The GAMIT/GLOBK 10.6 version was used to compute data with respect for thirteen reference sites of International Terrestrial Reference Frame (ITRF) 2008 surrounding Bali. The result shows that horizontal displacement varies between 1.93 and 22.53 mm/yr dominantly northeastward. Vertical displacement ranges at -184.34 to 33.79 mm/yr. The result of modeling using Coulomb 3.3 version indicates the deformation in Bali was mostly contributed by subduction at the southern part, West and East Flores Back-Arc Thrust at the north, Lombok Strait Fault and a fault at the eastern coast of Bali with the estimation maximum magnitude of 7.1, 6.6, 6.8, 5.8, and 5.2, respectively.
Kelas Situs Tanah Kota Banda Aceh Berdasarkan Nilai Periode Dominan Mikrotremor Sulaeman, Cecep; Solikhin, Akhmad
Jurnal Lingkungan dan Bencana Geologi Vol 8, No 3 (2017)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3056.362 KB) | DOI: 10.34126/jlbg.v8i3.175

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ABSTRAKPengukuran mikrotremor di Kota Banda Aceh telah dilakukan untuk mengetahui periode dominan dan nilai faktoramplifikasi guncangan gempa bumi. Pengukuran dilakukan pada 92 titik ukur memakai seismometer 3 komponenmodel Lennartz LE-3D berperiode natural 5 detik dan perekam digital model SARA SL-06 24 bit. Peta mikrotremorKota Banda Aceh terdiri atas periode dominan dan H/V amplifikasi. Periode dominan Kota Banda Aceh menunjukkanterdapat tiga kelas situs tanah yaitu : kelas situs C (tanah keras) dengan nilai periode dominan 0,2 detik < T ≤ 0,4detik, kelas D (tanah kaku) dengan nilai periode dominan antara 0,4 detik hingga 0,6 detik, dan kelas E (tanah lunak)dengan nilai periode dominan di atas 0,6 detik. Kelas situs D dan E menyebar hampir ke semua kecamatan sementarakelas situs C hanya terdapat di Kutaraja. Nilai H/V amplifikasi Kota Banda Aceh bervariasi antara 1,98 hingga 5,88.Kata kunci : periode dominan, ampilifikasi, kelas situs tanah.ABSTRACTMicrotremor measurement was conducted to obtain dominant period and site amplification factor of Banda AcehCity. The measurements were carried out in 92 sites in the city using 3-component-seismometer Lennartz LE-3D withnatural period 5 s and data logger model SARA SL-06 24 bit. The microtremor map of Banda Aceh City consists ofdominant period and H/V amplification factor maps. The dominant period of Banda Aceh City consisting of three siteclasses are C (hard soil) with dominant period 0.2 s < T ≤ 0.4 s, D (stiff soil) with dominant period between 0.4 sto 0.6 s, and E (soft soil) with dominant period greater than 0.6 s. Site class D and E areas stretch out almost in allsubdistricts, while C class is only in Kutaraja. The H/V amplification value of Banda Aceh city varies between 1.98and 5.88.Keywords : dominant period, amplification, site class.
Pengaruh Gempabumi Tektonik Terhadap Aktivitas G. Gede Hidayati, Sri; Sulaeman, Cecep; Supartoyo, Supartoyo; Kriswati, Estu
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 4 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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In addition to home for seven active volcanoes, West Java, is also having high tectonic activity, owing to its close distance from subduction zone and crustal fault. The Cimandiri Fault extends about 100 km from southwest to the northeast ward through Sukabumi area. Gede Volcano with high seismic activity is sitting 20 km north of Cimandiri Fault. Shallow earthquakes often occur around Gede volcano and their sources are fairly close to the Cimandiri valley. Feltearthquakes occurred in 2007, 2010, 2012 and 2014,where the source supposed to be around Cimandiri valley,were followed by volcano-tectonic (VT) earthquake swarms in Gede Volcano. These swarms probably indicate that there is a linkage between tectonic and Gede volcano activities. However, the swarms were followed by less significant changes in volcanic activity. GPS data during measurement period of 2006-2015 show the existence of a fault with main stress in the northwest-southeast direction. The mechanism of the Cimandiri Fault is reverse fault with sinistral slip component and sinistral strike slip fault, while the swarm of VT earthquakes in Gede Volcano is dominated by reverse and normal faults. Tectonic earthquakes may trigger nearby volcanic eruption; it depends on the state of magma of the volcano and the magnitude of the earthquake.Keyword: Tectonic, Cimandiri fault, VT earthquake, Gede Volcano.
Deformasi Gunung Guntur berdasarkan data GPS Sulaeman, Cecep; Hidayati, Sri; Loeqman, Agoes; Suparman, Yasa; Shahbana, Devy K.
Jurnal Lingkungan dan Bencana Geologi Vol 1, No 1 (2010)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (547.257 KB) | DOI: 10.34126/jlbg.v1i1.3

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SARIPenelitian dengan metoda Global Positioning System (GPS) di Gunung Guntur secara berkala telah dilakukan sejak tahun 1996. Berdasarkan hasil penelitian Juni 1997 sampai dengan Juni 2009, secara umum arah pergeseran horisontal titik ukur GPS ke baratlaut dengan besar pergeseran antara 0,7 cm sampaidengan 7,7 cm. Estimasi sumber deformasi menunjukkan bahwa penyebab terjadinya deformasi adalah sesar normal dan sesar oblique mengiri. Berdasarkan nilai dilatasi dan perubahan statik stres, Gunung Guntur merupakan daerah dengan nilai dilatasi negatif dan perubahan statik stres negatif.Kata kunci: Deformasi, sesarABSTRACTGPS survey on Guntur volcano has been done since 1996 periodically. Based on position data in the period of June 1997 until June 2009, horizontal displacement generally to the northwest direction about 0.7 cm – 7.7 cm. The result of deformation source estimation showed that the source of deformation are normal fault and sinistral oblique fault. Based on dilatation value and static stress changes, the Guntur volcano is a region with negative dilatation value and decreasing static stress change.Keyword: Deformation, fault