scholarly journals Coseismic and postseismic deformation from the 2007 Bengkulu earthquake based on GPS Data

2021 ◽  
Vol 31 (2) ◽  
pp. 98
Author(s):  
Irwan Meilano ◽  
Susilo Susilo ◽  
Endra Gunawan ◽  
Suchi Rahmadani
Keyword(s):  
Principal Strain ◽  
Postseismic Deformation ◽  
Gps Data ◽  
Logarithmic Function ◽  
Megathrust Earthquake ◽  
Strain Estimation ◽  
West Sumatra ◽  
Extensional Strain

On September 12, 2007, a M8.5 megathrust earthquake occurred along the Sunda trench near Bengkulu, West Sumatra. GPS data in Sumatra have indicated the coseismic and postseismic deformations resulting from this earthquake. Our estimate of coseismic displacements suggests that the earthquake displaced up to ~1.8m at GPS stations located north of the epicenter. Moreover, our principal strain estimation in the region suggests that the maximum coseismic extensional strain is ~40 ppm. Our analysis of GPS data in the region suggests that the postseismic decay of the 2007 Bengkulu earthquake was 46 days, estimated using a logarithmic function.

scholarly journals PRELIMINARY ESTIMATION OF POSTSEISMIC DEFORMATION PARAMETERS FROM CONTINUOUS GPS DATA IN KOREA PENINSULA AND IEODO AFTER THE 2011 TOHOKU-OKI MW9.0 EARTHQUAKE

2016 ◽  
Vol XLII-4/W1 ◽  
pp. 55-59
Author(s):  
W. A. W. Aris ◽  
T. A. Musa ◽  
H. Lee ◽  
Y. Choi ◽  
H. Yoon
Keyword(s):  
Exponential Function ◽  
Deformation Characteristic ◽  
Postseismic Deformation ◽  
Tectonic Deformation ◽  
Gps Data ◽  
Research Station ◽  
Logarithmic Function ◽  
Exponential Functions ◽  
Deformation Parameters ◽  
Continuous Gps

This paper describes utilization of GPS data in Korea Peninsula and IEODO ocean research station for investigation of postseismic deformation characteristic after the 2011 Tohoku-oki Mw9.0 Earthquake. Analytical logarithmic and exponential functions were used to evaluate the postseismic deformation parameters. The results found that the data in Korea Peninsula and IEODO during periods of mid-2011 – mid-2014 are fit better using logarithmic function with deformation decay at 134.5 ±0.1 days than using the exponential function. The result also clearly indicates that further investigation into postseismic deformation over longer data span should be taken into account to explain tectonic deformation over the region.

scholarly journals ESTIMATION OF CO- AND POSTSEISMIC DEFORMATION AFTER THE Mw 8.6 NIAS-SEMEULUE AND Mw 8.5 BENGKULU EARTHQUAKES FROM CONTINUOUS GPS DATA

2016 ◽  
Vol XLII-4/W1 ◽  
pp. 61-64
Author(s):  
W. A. W. Aris ◽  
T. A. Musa ◽  
K. Omar
Keyword(s):  
Large Earthquake ◽  
Peninsular Malaysia ◽  
Reference Station ◽  
Postseismic Deformation ◽  
Tectonic Deformation ◽  
Gps Data ◽  
Decay Period ◽  
Global Positioning ◽  
Continuous Gps ◽  
The Impact

The Mw 8.5 Bengkulu earthquake of 30 September 2007 and the Mw8.6 28 March 2005 are considered amongst large earthquake ever recorded in Southeast Asia. The impact into tectonic deformation was recorded by a network of Global Positioning System (GPS) Continuously Operating Reference Station (CORS) within southern of Sumatra and west-coast of Peninsular Malaysia. The GPS data from the GPS CORS network has been deployed to investigate the characteristic of postseismic deformation due to the earthquakes. Analytical logarithmic and exponential function was applied to investigate the deformation decay period of postseismic deformation. This investigation provides a preliminary insight into postseismic cycle along the Sumatra subduction zone in particular and on the dynamics Peninsular Malaysia in general.

Postseismic deformation following the 2 July 2013 M 6.1 Aceh, Indonesia, earthquake estimated using GPS data

2019 ◽  
Vol 177 ◽  
pp. 146-151 ◽  
Author(s):  
Endra Gunawan ◽  
Sri Widiyantoro ◽  
Zulfakriza ◽  
Irwan Meilano ◽  
Cecep Pratama
Keyword(s):  
Postseismic Deformation ◽  
Gps Data

Strain estimation from flattened parallel folds: application of the Wellman method and Mohr circle

2006 ◽  
Vol 143 (2) ◽  
pp. 243-247 ◽  
Author(s):  
JYOTI SHAH ◽  
DEEPAK C. SRIVASTAVA
Keyword(s):  
Surface Modification ◽  
Numerical Methods ◽  
Circle Method ◽  
Principal Strain ◽  
Mohr Circle ◽  
Orthogonal Relationship ◽  
Strain Estimation ◽  
Homogeneous Strain

Parallel folds exhibit a characteristic orthogonal relationship between the tangent and the corresponding isogon drawn at any point on folded surface. Modification of parallel fold to flattened parallel fold by superimposition of homogeneous strain introduces an angular shear along the tangents at different points. The angular shears in different directions, obtained by measuring angles between the tangents and the corresponding isogons, can be used for estimation of flattening strain by a variety of geometrical and numerical methods. We show that several simple geometrical techniques, such as the Wellman method and the Mohr circle method, can rapidly decipher the strain from flattened parallel folds. These methods, in contrast to most of the existing methods of strain estimation, are independent of the assumption that one of the principal strain directions parallels the axial trace on the profile plane of fold.

Variable Slip Modes in Postseismic Deformation North of the April 16, 2016 Mw 7.8 Pedernales, Ecuador Megathrust Earthquake

2019 ◽  
Author(s):  
Mariah Chambers Hoskins ◽  
Anne Meltzer ◽  
Lillian Soto-Cordero ◽  
Josh Stachnik ◽  
Susan L. Beck ◽  
...  
Keyword(s):  
Postseismic Deformation ◽  
Megathrust Earthquake
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