Structure of the Makran subduction zone from wide-angle and reflection seismic data

Kopp, Christian; Fruehn, Juergen; Flueh, Ernst R.; Reichert, Christian; Kukowski, Nina; Bialas, J.; Klaeschen, Dirk

doi:10.1016/s0040-1951(00)00195-5

Cited by 228 publications

(207 citation statements)

References 16 publications

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“…By analogy with other deformed belts (e.g., North Panama Deformed Belt; Silver et al, 1995) and accretionary prisms (e.g., Barbados, Brown and Westbrook, 1987; Makran; Kopp et al, 2000 andKukoswki et al, 2001), the lower slope corresponds with the more active area of compressive deformation, and with the initial accretion process (Figs. 4b, 7e).…”

Section: Lower Slopementioning

confidence: 95%

“…Seismic reflection data from other convergent margins around the world show that part or all of these sediments and rocks are offscraped and accreted forming a sequence of imbricate thrust slices (e.g., Barbados (Moore and Biju-Duval, 1984); Cascadia (Davis and Hyndman, 1989); Makran (Kopp et al, 2000); Costa Rica (Shipley et al, 1992)). The morphological expression of the imbricate slices is a sequence of elongated, narrow, sub-parallel ridges.…”

mentioning

confidence: 99%

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Morphotectonics of the central Muertos thrust belt and Muertos Trough (northeastern Caribbean)

et al. 2009

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Section: Lower Slopementioning

confidence: 95%

mentioning

confidence: 99%

Morphotectonics of the central Muertos thrust belt and Muertos Trough (northeastern Caribbean)

et al. 2009

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“…Compared to the convergence rate of the other world's subduction zones, MSZ is a relatively slow-moving subduction zone. MSZ is extremely shallow subduction angle [6]. Seismic reflection profile across the MSZ showed that the MSZ includes extremely low dip angle ranging between 2° and 8° [7].…”

Section: Tectonic Settingsmentioning

confidence: 99%

Statistical Analysis of Earthquakes and Tsunami of Makran Subduction Zone (MSZ), and Tsunami Hazard Assessment of Gwadar Coast

Sultan¹

2017

J Earth Sci Clim Change

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Tsunami waves are the most underrated hazard affecting the life near coastal belts. With socio-economic developments in coastal region results in more hazardous from tsunami. The hazard assessment of tsunami is highly vital. The Makran region is exceptional in closure zone of Tethys; it is only segment east of the Mediterranean and west of Andaman arc in which subduction of oceanic lithosphere is still an ongoing process. The objective of present study highlights the seismicity of MSZ. It also describes the statistical analysis of the earthquake events after 1973 for the study area, and possible tsunamigenic effects on Gwadar Coast. Fault plane solutions are also correlated with structural map of the study area and delineated the neo-tectonic features. I also try to determine the tsunami hazard assessment, run-up, inundation, maximum sea surface height and first arrival time of the incident waves and amplitude.ComMIT is used to calculate tsunamigenic parameters at Gwadar coast. The tsunami hazard assessment describes the possible hazardous incidents in near or far future for the coastal area. The velocity estimation of tsunami waves at Gwadar coast depict that, waves have higher velocities. The impact of the tsunami waves will be more at the inner thin portion (Zone-A) of study area having an average elevation of 2 to 3 meters. Transpressional strike-slip system, the Ornach-Nal fault system, form the eastern boundary of the MSZ. The Minab-Zendan fault system forms the western boundary of the MSZ as a transition zone between the Zagros continental collision and the Makran Oceanic subduction [2]. To the south, Murry ridge delineates parts of the Arabian-Indian boundary.Recent studies by employing network of 27 GPS stations in Iran and northern Oman reveal that the subduction rate at the MSZ is about 19.5 mm/y -1 [5]. Compared to the convergence rate of the other world's subduction zones, MSZ is a relatively slow-moving subduction zone. MSZ is extremely shallow subduction angle [6]. Seismic reflection profile across the MSZ showed that the MSZ includes extremely low dip angle ranging between 2° and 8° [7]. Unlike the other world's subduction zones, there is no trench at the location of the MSZ [7]. As for many subduction zones, active mud volcanoes are present all along the MSZ [8]. Data setThe data set includes the earthquake catalogue, topography and bathymetry data for ComMIT. The earthquake event data is acquired from Pakistan Metrological Department (PMD), (This catalogue is ranging from 1990-2012. This catalogue has been used for interpreting the Seismicity of the area.) and United States Geological Survey (USGS), (This catalogue is ranging from 1973-2012. This catalogue has been used for Statistical Analysis.). The Centroid Moment Tensor has been used for the interpretation of Fault Plane Solutions (FPS). The Components of Present Study Seismological behavior of Makran subduction zone (Msz)The effect of earthquake energy on particular area depends upon several factors, like Magnitude, Lithology of th...

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“…The Makran accretionary wedge stretches from Iran to central Pakistan (Schluter et al 2002). It has been formed by the subduction of the oceanic portion of the Arabian Plate beneath Eurasia and is built up by sediments scraped off the Arabian Plate since early Tertiary (Kopp et al 2000). Stoneley (1974) was the first to propose a subduction zone along the Makran zone.…”

Section: Makran Subduction Zonementioning

confidence: 99%

Probabilistic seismic hazard maps for the sultanate of Oman

et al. 2012

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This study presents the results of the first probabilistic seismic hazard assessment (PSHA) in the framework of logic tree for Oman. The earthquake catalogue was homogenized, declustered, and used to define seismotectonic source model that characterizes the seismicity of Oman. Two seismic source models were used in the current study; the first consists of 26 seismic source zones, while the second is expressing the alternative view that seismicity is uniform along the entire Makran and Zagros zones. The recurrence parameters for all the seismogenic zones were determined using the doubly bounded exponential distribution except the zones of Makran, which were modelled using the characteristic distribution. Maximum earthquakes were determined and the horizontal ground accelerations in terms of geometric mean were calculated using ground-motion prediction relationships developed based upon seismic data obtained from active tectonic environments similar to those surrounding Oman. The alternative seismotectonic source models, maximum magnitude, and ground-motion prediction relationships were weighted and used to account for the epistemic uncertainty. Hazard maps at rock sites were produced for 5 % damped spectral acceleration (SA) values at 0.1, 0.2, 0.3, 1.0 and 2.0 s spectral periods as well as peak ground acceleration (PGA) for return periods of 475 and 2,475 years. The highest hazard is found in Khasab City with maximum SA at 0.2 s spectral period reaching 243 and 397 cm/s 2 for return periods 475 and 2,475 years, 123Nat ) 64:173-210 DOI 10.1007 respectively. The sensitivity analysis reveals that the choice of seismic source model and the ground-motion prediction equation influences the results most.

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Structure of the Makran subduction zone from wide-angle and reflection seismic data

Cited by 228 publications

References 16 publications

Morphotectonics of the central Muertos thrust belt and Muertos Trough (northeastern Caribbean)

Morphotectonics of the central Muertos thrust belt and Muertos Trough (northeastern Caribbean)

Statistical Analysis of Earthquakes and Tsunami of Makran Subduction Zone (MSZ), and Tsunami Hazard Assessment of Gwadar Coast

Probabilistic seismic hazard maps for the sultanate of Oman

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