Symptomatic Features of Intraplate Earthquakes

Gangopadhyay, Abhijit; Talwani, Pradeep

doi:10.1785/gssrl.74.6.863

Cited by 89 publications

(43 citation statements)

References 102 publications

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“…Seismic sections across CBF (e.g., along line 87; Attoh et al, 2004) clearly display evidence for active displacement and document cumulative normal-slip of >3 km, with south-side-down. This relation led to the suggestions that the intersection of the two fault zones (CBF and PF) is a zone of (a) crustal weakness allowing rupture to occur at low stress levels (Blundell, 1976) or (b) stress concentration which produces earthquakes in this and other intraplate environments (Gangopadhyay and Talwani, 2003).…”

Section: Discussionmentioning

confidence: 99%

The role of Pan-African structures in intraplate seismicity near the termination of the Romanche fracture zone, West Africa

Attoh

Brown

Haenlein

2005

Journal of African Earth Sciences

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Section: Discussionmentioning

confidence: 99%

The role of Pan-African structures in intraplate seismicity near the termination of the Romanche fracture zone, West Africa

Attoh

Brown

Haenlein

2005

Journal of African Earth Sciences

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“…In 1811 and 1812, a sequence of three large (Mw ≥ 7) intraplate earthquakes occurred in New Madrid, Missouri, central USA. As summarized in Schulte and Mooney (2005), the New Madrid region is an example of intraplate seismicity associated with a paleo-rift, a correlation that has been found on a global scale in several studies (Sbar and Sykes, 1973;Sykes, 1978;Hinze et al, 1988;Johnston and Kanter, 1990;Johnston et al, 1994;Gangopadhyay and Talwani, 2003). The New Madrid earthquakes of the nineteenth century caused hundreds of casualties and were felt over an area of more than 120,000 square km.…”

Section: Intraplate Earthquakesmentioning

confidence: 92%

Recent Developments in Earthquake Hazards Studies

Mooney

White

2009

New Frontiers in Integrated Solid Earth Sciences

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In recent years, there has been great progress understanding the underlying causes of earthquakes, as well as forecasting their occurrence and preparing communities for their damaging effects. Plate tectonic theory explains the occurrence of earthquakes at discrete plate boundaries, such as subduction zones and transform faults, but diffuse plate boundaries are also common. Seismic hazards are distributed over a broad region within diffuse plate boundaries. Intraplate earthquakes occur in otherwise stable crust located far away from any plate boundary, and can cause great loss of life and property. These earthquakes cannot be explained by classical plate tectonics, and as such, are a topic of great scientific debate. Earthquake hazards are determined by a number of factors, among which the earthquake magnitude is only one factor. Other critical factors include population density, the potential for secondary hazards, such as fire, landslides and tsunamis, and the vulnerability of man-made structures to severe strong ground motion. In order to reduce earthquake hazards, engineers and scientists are taking advantage of new technologies to advance the fields of earthquake forecasting and mitigation. Seismicity is effectively monitored in many regions with regional networks, and world seismicity is monitored by the Global Seismic Network that consists of more than 150 high-quality, broadband seismic stations using satellite telemetry systems. Global Positioning Satellite (GPS) systems monitor crustal strain in tectonically active and intraplate regions. A relatively recent technology, Interferometric

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“…Interestingly, 64% of the global stable continental region seismicity is associated with extensional basins or grabens (Johnston et al 1996, Schulte andMooney 2005). In other words, failed rifts represent the most important pre-existing zone of crustal weakness for intraplate seismicity as revealed from a global compilation (Gangopadhyay and Talwani 2003).…”

Section: Seismotectonic Implicationsmentioning

confidence: 99%

On the footprints of a major Brazilian Amazon earthquake

Veloso

2014

An. Acad. Bras. Ciênc.

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Combining historical accounts and seismological studies, three hundred years of dormant information emerged as a source of the largest known seismic event that rocked Brazil since the beginning of our colonization. The probable epicenter location of the 1690 tremor lies on the left bank of the Amazon River, about 45 km downstream from the modern day Manaus. A year later, while passing this area, a missionary met witnesses of the tremor and observed remarkable changes in the topography and vegetation along the margin of the river. By 1692 another priest confirmed this event and the occurrence of large waves in the river, which led to the flooding of the Native Indians' terrains. The tremor spread seismic waves throughout the forest and shook indigenous constructions as far as one thousand kilometers away. A calculation of the seismic parameters shows an estimated magnitude of 7, a maximum intensity of IX MM and a felt area of about 2 million km 2 . Due to the long recurrence period for this type of tremor, the discovery of one of these events is valuable for seismic global intraplate studies. As for Brazil, it unravels the myth that the country was never hit by severe earthquakes.

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Symptomatic Features of Intraplate Earthquakes

Cited by 89 publications

References 102 publications

The role of Pan-African structures in intraplate seismicity near the termination of the Romanche fracture zone, West Africa

The role of Pan-African structures in intraplate seismicity near the termination of the Romanche fracture zone, West Africa

Recent Developments in Earthquake Hazards Studies

On the footprints of a major Brazilian Amazon earthquake

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