276 research outputs found
Wave run-up of a possible Anak-Krakatau tsunami on planned and optimized Jakarta Sea Dike
Get PDFThe infrastructural plans in the Jakarta Bay to reduce risks of flooding in Jakarta city comprise a large Sea Dike that encloses a retention lake. Part of the planned dike has the shape of the iconic Garuda bird. This paper shows that if in the future an explosion of Anak Krakatau will occur with strength 1/4th of the original Karkatau 1883 explosion, wave crests of 11m and troughs of 6m may collide against the bird's head. As an alternative example, a more optimized design of the dike is constructed that reduces the maximal wave effects considerably.</p
Simple deformation modelling using GNSS GPS data at Minahasa subduction
No full textNorth Sulawesi Trench or Minahasa subduction area is a subduction zone between the oceanic crust of Sulawesi Sea and the North Sulawesi Arm located at the triple junction in Eastern Indonesia. This subduction activity causes the North Arm of Sulawesi as an earthquake-prone area. Tectonic activities in the region can be studied through geodetic monitoring using GNSS GPS observations and by physical modelling from the rate of geodetic geometric results. Yearly GNSS GPS campaign have been conducted in the region from 1997 to 2008 and continuously observed by BIG from 2008 to 2016 using permanent GNSS GPS stasion. The coordinates of monitoring stations realized in ITRF-2008 provide residual RMS values of 3.13 mm, 4.15 mm and 7.26 mm for the northern, eastern and vertical components, where this indicates a high degree of accuracy. A simple estimation profile using GNSS GPS data based on the Okada elastic equation for the subduction zone shows a subduction movement ranging from 4 to 5 cm/yr with a locking depth of about 50 km, a dip 300 and ending in the post-seismic phase due to the sequence of earthquakes occurring in Minahasa since January 1, 1996 Mw 7.9 to 16 June 2002 Mw 5.9.Astrodynamics & Space Mission
Fault systems of the eastern Indonesian triple junction:evaluation of Quaternary activity and implications for seismic hazards
Get PDFEastern Indonesia is the site of intense deformation related to convergence between Australia, Eurasia, the Pacific and the Philippine Sea Plate. Analysis of tectonic geomorphology, drainage patterns, exhumed faults and historical seismicity highlights faults that have been active during the Quaternary (Pleistocene to present day), even if instrumental records suggest some are presently inactive. Of twenty-seven largely onshore fault systems studied, eleven show evidence of a maximal tectonic rate, a further five show evidence of rapid tectonic activity. Three faults indicating slow to minimal tectonic rate nonetheless show indications of Quaternary activity, and may simply have long interseismic periods. Although most studied fault systems are highly segmented, many are linked by narrow (<3 km) step-overs to form one or more long, quasi-continuous segments that are capable of producing M >7.5 earthquakes. Sinistral shear across the soft-linked Yapen and Tarera-Aiduna faults and their continuation into the transpressive Seram fold-thrust belt represents perhaps the most active belt of deformation and hence greatest seismic hazard in the region. However, the Palu-Koro Fault, being long, straight and capable of generating supershear ruptures, is considered to represent the greatest seismic risk of all the faults evaluated in this region in view of important strike-slip strands that appear to traverse the thick Quaternary basin fill below Palu city
Spatial modeling of infrastructure resilience to the natural disasters using baseline resilience indicators for communities (BRIC) – Case study: 5 districts/cities of Bandung Basin area
No full textCatatan Kuliah Umum Rapid Earthquake Magnitude Estimation Using Near Realtime GPS Data
No full textKuliah Umum Rapid Earthquake Magnitude Estimation Using Near Realtime GPS Data Prof. Yusaku Ohta Associate Professor Crustal Physics Laboratory, Research Center for Prediction of Earthquakes and Volcanic Eruptions Tohoku UniversityAcara bertempat di Auditorium BMKG, pada tanggal 9 Agustus 2016, berlangsung dari jam 09:00 WIB sampai dengan jam 13:00 WIB.Live at: http://media.bmkg.go.id/Live.bmkg?ID=2625949045519124http://www.bmkg.go.idVia Dr. Rahma Hanifa, Dr. Abdul Muhari, Himpunan Mahasiswa Oseanografi ITB, Carmadi Machbub, Ary Setijadi Prihatmanto, Egi Hidayat, Astri Novianty, Irwan Meilano, Irina Rafliana</p
Spatial modelling of disaster resilience using infrastructure components of baseline resilience indicators for communities (BRIC) in special region of Yogyakarta
No full textDeformation analysis in the East Nusa Tenggara and Banda Islands based on GPS observation from 2010-2015
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B-value and slip rate sensitivity analysis for PGA value in Lembang fault and Cimandiri fault area
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