Determination of attenuation relationships and focal mechanisms for Northern Vietnam
Date Issued
2012
Date
2012
Author(s)
Le Minh, Nguyen
Abstract
Vietnam is located in South East Asia and is bounded by the Pacific and Mediterranean–Himalaya seismic belts on its eastern, western, and southern sides,respectively. The tectonic relationship had led this territory to moderate seismic activity.
Although seismicity is moderate in Vietnam, it must be seriously considered for disaster prevention and mitigation strategy. Many studies have been performed in northern Vietnam for the recent period. However, some basic seismological problems in Vietnam have still not been resolved.
This work describes the use of broadband data to determine basic seismological problems such as the local magnitude scale, the strong ground motion attenuation curves, and the focal mechanisms for northern Vietnam. Three studies were conducted. One study using broadband data comprised a total of 202 amplitude records from 14 broadband stations. The records were obtained from 36 shallow earthquakes with focal depths of less than 36 km that occurred in and around northern Vietnam from 01/2006 - 10/2007. The new distance-correction function obtained from this study was log 1.74log( ) 0.00048 0.522, 0
Subjects
Northern Vietnam
local magnitude
attenuation relationships
focal mechanism
SDGs
Type
thesis
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