Active fault segmentation of the Çivril Graben System and surface rupture of the 1 October 1995 Dinar earthquake (Mw 6.2), Southwestern Anatolia, Turkey

2018 ◽  
Vol 166 ◽  
pp. 136-151 ◽  
Author(s):  
Selim Özalp ◽  
Ömer Emre ◽  
Fuat Şaroğlu ◽  
Volkan Özaksoy ◽  
Hasan Elmacı ◽  
...  
Keyword(s):  
Active Fault ◽  
Surface Rupture ◽  
Fault Segmentation

scholarly journals Preliminary paleoearthquake investigations of active faults on Awaji Island, Japan,
 in relation to the 1995 Great Hanshin (Kobe) earthquake

1996 ◽  
Vol 29 (3) ◽  
pp. 172-177
Author(s):  
R. Van Dissen ◽  
J. Begg ◽  
Y. Awata
Keyword(s):  
New Zealand ◽  
Active Fault ◽  
Active Faults ◽  
Geological Survey ◽  
Historical Records ◽  
Surface Rupture ◽  
Kobe Earthquake ◽  
Nojima Fault ◽  
One Year ◽  
Hanshin Earthquake

Approximately one year after the Great Hanshin (Kobe) Earthquake, two New Zealand geologists were invited to help with the Geological Survey of Japan's paleoearthquake/active fault studies in the Kobe/Awaji area. Trenches excavated across the Nojima fault, which ruptured during the Great Hanshin Earthquake, showed evidence of past surface rupture earthquakes, with the age of the penultimate earthquake estimated at approximately 2000 years. A trench across the Higashiura fault, located 3-4 km southeast of the Nojima fault, revealed at least two past surface rupture earthquakes. The timing of the older earthquakes is not yet known, but pottery fragments found in the trench constrain the timing of the most recent earthquake at less than 500-600 years. Historical records for this part of Japan suggest that within the last 700 years there has been only one regionally felt earthquake prior to the 1995 Great Hanshin Earthquake, and this was the AD 1596 Keicho Earthquake. It thus seems reasonable to suggest that the Higashiura fault was, at least in part, the source of the AD 1596 Keicho Earthquake.

Active fault segmentation in Northern Tunisia

2020 ◽  
Vol 139 ◽  
pp. 104146 ◽  
Author(s):  
S. Gaidi ◽  
G. Booth-Rea ◽  
F. Melki ◽  
W. Marzougui ◽  
P. Ruano ◽  
...  
Keyword(s):  
Active Fault ◽  
Northern Tunisia ◽  
Fault Segmentation

PFDHA modelling based on new empirical regressions for distributed faulting on dip-slip earthquakes

2020 ◽  
Author(s):  
Fiia Nurminen ◽  
Stéphane Baize ◽  
Paolo Boncio ◽  
Bruno Pace ◽  
Oona Scotti ◽  
...  
Keyword(s):  
Decision Making ◽  
Active Fault ◽  
Numerical Estimate ◽  
Hazard Analysis ◽  
Normal Faulting ◽  
Surface Rupture ◽  
Regression Parameters ◽  
Surface Ruptures ◽  
A Site ◽  
Fault Displacement

<p>Probabilistic fault displacement hazard analysis (PFDHA) is needed for a numerical estimate of the displacement likely to occur at a site near an active fault in case of a surface faulting earthquake. The methodology is based on parameters describing the probability of occurrence, and the spatial distribution of the displacement on and off-fault. The methodology was created for normal faulting setting, and has been later complemented with the parameters for other slip types, especially regarding the principal fault rupturing. Based on empirical fault displacement data in the Worldwide and Unified Database of Surface Ruptures (SURE), we are presenting new regression parameters for distributed faulting for dip-slip earthquakes. The parameters are used in a computational model for assessing the surface rupture hazard near active dip-slip faults. The modelling results the probability distribution of exceeding a chosen level of displacement, and can be used in stcture design and land-use related decision making in areas where surface faulting hazard should be considered.</p>

Evidence of Previous Faulting along the 2019 Ridgecrest, California, Earthquake Ruptures

2020 ◽  
Vol 110 (4) ◽  
pp. 1427-1456 ◽  
Author(s):  
Jessica Ann Thompson Jobe ◽  
Belle Philibosian ◽  
Colin Chupik ◽  
Timothy Dawson ◽  
Scott E. K. Bennett ◽  
...  
Keyword(s):  
Active Fault ◽  
Active Faults ◽  
Ground Surface ◽  
Vertical Motion ◽  
Fault System ◽  
Field Observations ◽  
Surface Rupture ◽  
Earthquake Ruptures ◽  
Slip Displacement ◽  
Surface Ruptures

ABSTRACT The July 2019 Ridgecrest earthquakes in southeastern California were characterized as surprising by some, because only ∼35% of the rupture occurred on previously mapped faults. Employing more detailed inspection of pre-event high-resolution topography and imagery in combination with field observations, we document evidence of active faulting in the landscape along the entire fault system. Scarps, deflected drainages, and lineaments and contrasts in topography, vegetation, and ground color demonstrate previous slip on a dense network of orthogonal faults, consistent with patterns of ground surface rupture observed in 2019. Not all of these newly mapped fault strands ruptured in 2019. Outcrop-scale field observations additionally reveal tufa lineaments and sheared Quaternary deposits. Neotectonic features are commonly short (<2  km), discontinuous, and display en echelon patterns along both the M 6.4 and M 7.1 ruptures. These features are generally more prominent and better preserved outside the late Pleistocene lake basins. Fault expression may also be related to deformation style: scarps and topographic lineaments are more prevalent in areas where substantial vertical motion occurred in 2019. Where strike-slip displacement dominated in 2019, the faults are mainly expressed by less prominent tonal and vegetation features. Both the northeast- and northwest-trending active-fault systems are subparallel to regional bedrock fabrics that were established as early as ∼150  Ma, and may be reactivating these older structures. Overall, we estimate that 50%–70% (i.e., an additional 15%–35%) of the 2019 surface ruptures could have been recognized as active faults with detailed inspection of pre-earthquake data. Similar detailed mapping of potential neotectonic features could help improve seismic hazard analyses in other regions of eastern California and elsewhere that likely have distributed faulting or incompletely mapped faults. In areas where faults cannot be resolved as single throughgoing structures, we recommend a zone of potential faulting should be used as a hazard model input.

Corrigendum to “Active fault segmentation in southwest Bulgaria and Coulomb stress triggering of the 1904 earthquake sequence” [J. Geodyn. 40 (2005) 316–333]

2007 ◽  
Vol 43 (3) ◽  
pp. 415
Author(s):  
Athanassios Ganas ◽  
Stefan Shanov ◽  
George Drakatos ◽  
Nikolai Dobrev ◽  
Sotiris Sboras ◽  
...  
Keyword(s):  
Active Fault ◽  
Earthquake Sequence ◽  
Coulomb Stress ◽  
Fault Segmentation ◽  
Stress Triggering

scholarly journals Tectonic model and fault segmentation of the Median Tectonic Line active fault system on Shikoku, Japan

Tectonics ◽  
2009 ◽  
Vol 28 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Michiharu Ikeda ◽  
Shinji Toda ◽  
Shuji Kobayashi ◽  
Yuki Ohno ◽  
Naoki Nishizaka ◽  
...  
Keyword(s):  
Active Fault ◽  
Fault System ◽  
Fault Segmentation ◽  
Tectonic Model ◽  
Median Tectonic Line ◽  
Tectonic Line

scholarly journals Crustal velocity and interseismic strain-rate on possible zones for large earthquakes in the Garhwal–Kumaun Himalaya

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
John P. Pappachen ◽  
Rajesh Sathiyaseelan ◽  
Param K. Gautam ◽  
Sanjit Kumar Pal
Keyword(s):  
Strain Rate ◽  
Active Fault ◽  
Surface Strain ◽  
Seismic Gap ◽  
Surface Rupture ◽  
Nw Himalaya ◽  
Crustal Velocity ◽  
Central Seismic Gap ◽  
Large Earthquakes ◽  
Low Strain Rate

AbstractThe possibility of a major earthquake like 2015 Gorkha–Nepal or even greater is anticipated in the Garhwal–Kumaun region in the Central Seismic Gap of the NW Himalaya. The interseismic strain-rate from GPS derived crustal velocities show multifaceted strain-rate pattern in the region and are classified into four different strain-rate zones. Besides compressional, we identified two NE–SW orienting low strain rate (~ 20 nstrain/a) zones; namely, the Ramganga-Baijro and the Nainital-Almora, where large earthquakes can occur. These zones have surface locking widths of ~ 72 and ~ 75 km respectively from the Frontal to the Outer Lesser Himalaya, where no significant surface rupture and associated large earthquakes were observed for the last 100 years. However, strain reducing extensional deformation zone that appears sandwiched between the low strain-rate zones pose uncertainties on the occurences of large earthquakes in the locked zone. Nevertheless, such zone acts as a conduit to transfer strain from the compressional zone (> 100 nstrain/a) to the deforming frontal active fault systems. We also observed a curvilinear surface strain-rate pattern in the Chamoli cluster and explained how asymmetric crustal accommodation processes at the northwest and the southeast edges of the Almora Klippe, cause clockwise rotational couple on the upper crust moving over the MHT.

Buildings Setbacks Research From Surface-Fault-Rupture Statistical Analysis

2012 ◽  
Vol 204-208 ◽  
pp. 2410-2418 ◽  
Author(s):  
Jian Yi Zhang ◽  
Jing Shan Bo ◽  
Guo Dong Xu ◽  
Jing Yi Huang
Keyword(s):  
Fault Location ◽  
Active Fault ◽  
Active Faults ◽  
Damage Index ◽  
Earthquake Hazard ◽  
Hazard Evaluation ◽  
Fault Rupture ◽  
Surface Rupture ◽  
Wenchuan Ms8.0 Earthquake ◽  
Evaluation Project

With the author and others scientific investigation on China Wenchuan Ms8.0 earthquake, China Yushu Ms7.1 earthquake and "China's active fault surveying and earthquake hazard evaluation project" relevant data results and the world requirements about project setback of active faults, etc., this paper concluded that: (1) width of Surface-Fault-Rupture is about 40m by statistics, or from the main surface rupture trace about 20m; (2) width of Surface-Fault-Rupture S and the fault vertical offset V, statistical diagrams and formulas S=8.72+9.01V; (3) Setback of the main surface trace D and buildings from damage index I, statistical diagrams and formulas I=0.7969-0.00231D; (4) based on the first three results and by the actual statistics of accuracy, we get three active fault location accuracy level of the standard i, ii, iii, respectively, the error is ± 5m, ± 25m, ± 60m, also, can give this level of standards of Surface-Fault-Rupture width to the actual engineering applications.

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