Seismic hazard assessment in Central Asia
type: CreativeWork
description: Central Asia is one of the world’s most seismically active regions, with the highest level of seismic hazard. Usually seismic hazard is estimated considering ground motion at rock site, but since the ground motion could vary significantly over short distances due to local surficial geology, it is important to consider locally estimated site effects in seismic hazard assessment. Under the GSHAP project carried out in 1992-1999, seismic hazard was calculated at a global scale, including Central Asia. However, an update of this assessment is required in order to consider updated and more recent datasets. Therefore, purpose of this study is to: 1) assess the updated probabilistic seismic hazard at the regional level in Central Asia, and 2) consider the hazard assessment at the local level, including empirically-estimated site effects. As part of the GEM (Global Earthquake Model) initiative, this study is carried out within the EMCA (Earthquake Model Central Asia) project, which aims to calculate an updated cross border harmonized seismic hazard study at the regional level in Central Asia. In this study, the seismic hazard is calculated for Central Asia using an updated earthquake catalogue with respect to the Soviet times and the GSHAP project. The earthquake catalogue has been assembled to cover until 2009 from different sources, containing both instrumental and historical events, and is homogenized to surface wave magnitude MLH from different magnitude scales. Shallow seismicity (< 50 km) is considered for the calculation of seismic hazard assessment in the region. Different seismic source models are used for the calculation of seismic hazard. These include the area source model and smoothed seismicity models. In smoothed seismicity models, the approaches of Frankel (1995) and Woo (1996) approach are used. In particular, along with the Gaussian kernel function with fixed correlation distance (smoothing bandwidth) approach of Frankel (1995), the adaptive kernel functio…
abstract: Central Asia is one of the world’s most seismically active regions, with the highest level of seismic hazard. Usually seismic hazard is estimated considering ground motion at rock site, but since the ground motion could vary significantly over short distances due to local surficial geology, it is important to consider locally estimated site effects in seismic hazard assessment. Under the GSHAP project carried out in 1992-1999, seismic hazard was calculated at a global scale, including Central Asia. However, an update of this assessment is required in order to consider updated and more recent datasets. Therefore, purpose of this study is to: 1) assess the updated probabilistic seismic hazard at the regional level in Central Asia, and 2) consider the hazard assessment at the local level, including empirically-estimated site effects. As part of the GEM (Global Earthquake Model) initiative, this study is carried out within the EMCA (Earthquake Model Central Asia) project, which aims to calculate an updated cross border harmonized seismic hazard study at the regional level in Central Asia. In this study, the seismic hazard is calculated for Central Asia using an updated earthquake catalogue with respect to the Soviet times and the GSHAP project. The earthquake catalogue has been assembled to cover until 2009 from different sources, containing both instrumental and historical events, and is homogenized to surface wave magnitude MLH from different magnitude scales. Shallow seismicity (< 50 km) is considered for the calculation of seismic hazard assessment in the region. Different seismic source models are used for the calculation of seismic hazard. These include the area source model and smoothed seismicity models. In smoothed seismicity models, the approaches of Frankel (1995) and Woo (1996) approach are used. In particular, along with the Gaussian kernel function with fixed correlation distance (smoothing bandwidth) approach of Frankel (1995), the adaptive kernel functio…
author: Ullah, Shahid
language: en
license: http://rightsstatements.org/vocab/InC/1.0/
date published: 2016
date modified: 2026-07-27T21:28:24Z
provider: Technische Universität Berlin
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Technische Universität Berlin

PropertyValue
property ID: DOI
value: 10.14279/depositonce-5069