Preliminary result: Earthquake rates analysis from seismic and geodetic strain at Nusa Tenggara and Banda region, Indonesia

2018 ◽  
Author(s):  
Rahayu Robiana ◽  
Irwan Meilano ◽  
Andri Dian Nugraha ◽  
Susilo
Keyword(s):  
Geodetic Strain ◽  
Banda Region

scholarly journals Author Correction: A Geodetic Strain Rate Model for the East African Rift System

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
D. S. Stamps ◽  
E. Saria ◽  
C. Kreemer
Keyword(s):  
Strain Rate ◽  
East African Rift ◽  
Rift System ◽  
East African Rift System ◽  
Rate Model ◽  
East African ◽  
Geodetic Strain Rate ◽  
African Rift ◽  
Geodetic Strain

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

scholarly journals Crustal deformation rates in Kashmir valley and adjoining regions from continuous GPS measurements from 2008 to 2019

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Sridevi Jade ◽  
Ramees R. Mir ◽  
Chiranjeevi G. Vivek ◽  
T. S. Shrungeshwara ◽  
I. A. Parvez ◽  
...  
Keyword(s):  
Dislocation Model ◽  
Seismic Gap ◽  
Extension Rate ◽  
Kashmir Valley ◽  
Low Velocity ◽  
The North ◽  
Geodetic Strain Rate ◽  
Gps Velocities ◽  
Continuous Gps ◽  
Geodetic Strain

Abstract We present GPS velocities in Kashmir valley and adjoining regions from continuous Global Positioning System (cGPS) network during 2008 to 2019. Results indicate total arc normal shortening rates of ~ 14 mm/year across this transect of Himalaya that is comparable to the rates of ~ 10 to 20 mm/year reported else-where in the 2500 km Himalaya Arc. For the first time in Himalayas, arc-parallel extension rate of ~ 7 mm/year was recorded in the Kashmir valley, pointing to oblique deformation. Inverse modeling of the contemporary deformation rates in Kashmir valley indicate oblique slip of ~ 16 mm/year along the decollement with locking depth of ~ 15 km and width of ~ 145 km. This result is consistent with the recorded micro-seismicity and low velocity layer at a depth of 12 to 16 km beneath the Kashmir valley obtained from collocated broadband seismic network. Geodetic strain rates are consistent with the dislocation model and micro-seismic activity, with high strain accumulation (~ 7e−08 maximum compression) to the north of Kashmir valley and south of Zanskar ranges. Assuming the stored energy was fully released during 1555 earthquake, high geodetic strain rate since then and observed micro-seismicity point to probable future large earthquakes of Mw ~ 7.7 in Kashmir seismic gap.

New Insight into the Recent Earthquake Activity in North Cambay Basin, Western India: Seismological and Geodetic Perspectives

2019 ◽  
Vol 109 (6) ◽  
pp. 2240-2251 ◽  
Author(s):  
Pallabee Choudhury ◽  
Sumer Chopra ◽  
Charu Kamra ◽  
Archana Das
Keyword(s):  
Additional Stress ◽  
Western India ◽  
Earthquake Activity ◽  
Maximum Magnitude ◽  
Cambay Basin ◽  
Maximum Deformation ◽  
The Past ◽  
Average Strain Rate ◽  
Geodetic Strain ◽  
Strain Tensors

Abstract The intraplate Gujarat region located at the trijunction of three failed rifts, Kachchh, Narmada, and Cambay, is one of the most seismically active intraplate regions of the world. Among these three, the Cambay basin has been investigated thoroughly for petroleum. However, the basin has not been studied from a seismotectonic perspective. For the past few years, the northern part of the Cambay basin is becoming active with reasonably frequent earthquake occurrences. In the past 10 yr, ∼995 earthquakes have been recorded from the region with a maximum magnitude up to 4.2. Most of the earthquakes are in the magnitude range 1–3. Since 2009, four Global Positioning System (GPS) stations have been in operation in the vicinity of the Cambay basin, and a maximum deformation of 1.8±0.1  mm/yr has been estimated. The GPS‐derived strain rates of ∼0.02–0.03  microstrain/yr are prevalent in the region. An average strain rate of 0.02  microstrain/yr in the region can generate an earthquake of magnitude 6.4. The focal mechanisms of the earthquakes have been mostly normal with strike‐slip component and corroborated by the geodetic strain tensors. Most of the seismicity is clustered in the basement ridges, striking along pre‐existing Precambrian trends that cross the Cambay basin. Complex geodynamics have developed around the northern part of the Cambay rift because of the various movements along several faults, presence of basement ridges, and subsurface plutonic bodies in a failed rift, which are creating stresses and causing earthquakes in this part of the rift. We postulated that the highly heterogeneous subsurface structure beneath the northern part of the Cambay rift is creating additional stress, which is superimposing on the regional stress field substantially, and this mechanism is plausibly facilitating the localized extensional tectonics in the region where compression is expected.

scholarly journals Millenary M w  > 9.0 earthquakes required by geodetic strain in the Himalaya

2016 ◽  
Vol 43 (3) ◽  
pp. 1118-1123 ◽  
Author(s):  
V. L. Stevens ◽  
J.‐P. Avouac
Keyword(s):  
Geodetic Strain ◽  
The Himalaya
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