Wrench faulting in the northern Pakistan foreland region

Sercombe, William J.; Stratton, Margaret A.; Albertin, Martin; Wilson, Wayne P.; Roth, Bryan L.; Nieuwenhuise, Robert E. Van; Pivnik, David A.; Beck, Richard

doi:10.1190/1.1436997

Cited by 18 publications

(21 citation statements)

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“…Earlier Johnson, et al (1986) interpreted the Riwat thrust as an emergent thrust propagating up section from the basement. 1 285 74 27 53 14 -20 38 239 Left lateral strike slip 2 51 20 229 70 25 320 65 I38 Thrust 3 50 83 319 56 22 179 25 280 Left lateral strike slip 4 81 72 334 46 16 -158 45 308 Left lateral strike slip Sercombe, et al (1998) pointed out the fact that earthquake focal mechanism solutions (mostly strike-slip) have so far not been integrated into the models proposed by different researchers. The basement related strike slip solution of this event indicates that, at least in this area of the foreland, compressional tectonics is not the only factor prevailing.…”

Section: Focal Mechanism Solutionsmentioning

confidence: 95%

“…The models invoking duplex structure have recently been questioned (Pivnik, Sercombe, 1993;Sercombe, et al, 1998). These researchers recognize the presence of strike-slip faults on the surface and even in the basement.…”

Section: Geology Of the Areamentioning

confidence: 97%

“…Also shown in the figure to the north of the epicenter are the leftlateral strike slip faults that were plotted after Sercombe, et al (1998). According to Jadoon and Frisch (1997) Figure 3 Focal mechanism solutions of NPDZ earthquakes using P wave polarities, lower hemisphere projections thrust.…”

Section: Focal Mechanism Solutionsmentioning

confidence: 99%

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Focal mechanism study of north Potwar deformed zone, Pakistan

Lisa

Khan²,

Khwaja

2004

Acta Seimol. Sin.

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Northern Potwar Deformed Zone (NPDZ) is a part of the foreland zone of NW Himalayan folds and thrust belt. Seismicity map has been prepared for this region, which appears to be less active as compared with adjacent regions with apparently no distinct pattern or relationship with surface structures. Focal mechanism solutions of 4 events, for which required parameters are available, indicate left-lateral strike-slip faulting for 3 events and thrusting for one event. P-axes orientations are in NW-SE and NE-SW. Basement is most likely involved in the ongoing deformation.

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Section: Focal Mechanism Solutionsmentioning

confidence: 95%

Section: Geology Of the Areamentioning

confidence: 97%

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Focal mechanism study of north Potwar deformed zone, Pakistan

Lisa

Khan²,

Khwaja

2004

Acta Seimol. Sin.

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“…This difference may be related to lesser thickness of the Precambrian salt in the eastern area (830 m in the east and +2000 m in the west) and very low northward dip of the basement (1°-1.5°) as compared to central and western Potwar (2°-3°). Paleomagnetic studies have shown that originally, the structural trends developed perpendicular to the transport direction and subsequently acquired the present alignment because of the left lateral Jhelum strike-slip fault (McDougall and Khan 1990;Sercombe et al 1998). …”

Section: Geology Of the Areamentioning

confidence: 98%

Structural model of the Balkassar area, Potwar Plateau, Pakistan

Iqbal

Akhter

Bibi³

2015

Int J Earth Sci (Geol Rundsch)

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“…The northwards movement of Indo-Pakistan sub-plate is continues at the rate of 2 mm/year (Patriat and Achache 1984). Transpression or strike-slip faulting is also active in this compressional regime (Verma 1991;Sercombe et al 1998;MonaLisa et al 2004).…”

Section: Regional Geology and Tectonic Setting Of The Areamentioning

confidence: 99%

Seismicity distribution and focal mechanism solution of major earthquakes of northern Pakistan

et al. 2015

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Pakistan is situated very close to the subduction zone of Indian-Arabian plates and Indian-Eurasian plates. Thus, it is a country with moderate to high seismicity with a large number of major earthquakes. Therefore, the severity of seismic hazards of major earthquakes is not ignorable. The seismicity of northern areas of Pakistan (33-37°N and 70-76°E), which are the part of North West Himalaya, is studied. Three earthquake catalogues are selected and then completed for this purpose. The spatial distribution of their epicenters, as a function of depth, shows that most of the earthquakes (about 84 %) occurred in shallow to intermediate depths. Relationship between major faults and their source mechanism is also investigated. The Focal mechanism solutions of 39 significant earthquakes in this area, occurred in the period of 1976-2014 with magnitude M w [ 5.0, are also analyzed. The focal depth of these events is in the range of 10-244 km. Among 39 focal mechanisms, the majority of them located in lower crust. Global centroid moment tensor solutions indicate that the majority of the seismic events show strike-slip faulting with a left-lateral sense of motion, followed by thrust and normal faulting. Most of these focal mechanisms located in the HinduKush, a most seismically active, region. The major source of these events and thrusting is the subduction of the Indian plate under the Eurasian Plate. At shallow to intermediate depth, low-to-intermediate angle thrust faulting is dominant. It is seen that in a large number of seismic events the compressive stress is acting nearly in NNW-SSE to N-S directions.

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Wrench faulting in the northern Pakistan foreland region

Cited by 18 publications

References 0 publications

Focal mechanism study of north Potwar deformed zone, Pakistan

Focal mechanism study of north Potwar deformed zone, Pakistan

Structural model of the Balkassar area, Potwar Plateau, Pakistan

Seismicity distribution and focal mechanism solution of major earthquakes of northern Pakistan

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