Potentially induced earthquakes in Oklahoma, USA: Links between wastewater injection and the 2011 Mw 5.7 earthquake sequence

Geology ◽  
2013 ◽  
Vol 41 (6) ◽  
pp. 699-702 ◽  
Author(s):  
Katie M. Keranen ◽  
Heather M. Savage ◽  
Geoffrey A. Abers ◽  
Elizabeth S. Cochran
Keyword(s):  
Earthquake Sequence ◽  
Induced Earthquakes

Seismogenic Faults of the Changning Earthquake Sequence Constrained by High-Resolution Seismic Profiles in the Southwestern Sichuan Basin, China

2021 ◽  
Author(s):  
Renqi Lu ◽  
Dengfa He ◽  
Jing-Zeng Liu ◽  
Wei Tao ◽  
Hanyu Huang ◽  
...  
Keyword(s):  
High Resolution ◽  
Sichuan Basin ◽  
Structural Characteristics ◽  
Sedimentary Cover ◽  
Earthquake Sequence ◽  
Fault System ◽  
Unstable State ◽  
Induced Earthquakes ◽  
Seismicity Rate ◽  
Seismogenic Faults

Abstract The seismicity rate in the southwestern Sichuan basin, China, dramatically increased after 2014. The associated moderate earthquakes may have been induced by salt mining or shale gas exploration. The location of the seismogenic faults causing these moderate earthquakes has not been confirmed, resulting in a lack of understanding of the earthquake mechanisms in the study area. The detailed structural characteristics of pre-existing faults, which are typically responsible for induced seismicity, are unclear. In this study, we used high-resolution seismic reflection profiles in conjunction with geological, seismologic, and geodetic data to reveal the 3D distributions of the seismogenic faults. Basement thrust faults in the Changning anticline were identified using seismic interpretations and are associated with the 2019 Changning earthquake sequence. The geometry and location of these pre-existing faults are consistent with previous studies of the seismology and structural geology in the area. The well-developed pre-existing fault system in the sedimentary cover and basement makes the Changning area vulnerable to induced earthquakes. Present-day reactivation of the basement fault system reveals the unstable state of the local tectonic stress field. It is possible that the potential seismic risk in this region could be increased by industrial activity in the southwestern Sichuan basin.

A high-resolution seismic catalog for the 2020 Magna, Utah, earthquake sequence

2020 ◽  
Author(s):  
Guanning Pang ◽  
Keith Koper ◽  
Maria Mesimeri ◽  
Kristine Pankow ◽  
Benjamin Baker ◽  
...  
Keyword(s):  
High Resolution ◽  
Earthquake Sequence ◽  
Seismic Catalog

EARTHQUAKE EARLY WARNING DURING THE 2019 RIDGECREST EARTHQUAKE SEQUENCE: WHAT HAPPENED AND WHAT’S NEXT?

2019 ◽  
Author(s):  
Elizabeth S. Cochran ◽  
◽  
Sarah E. Minson ◽  
Annemarie S. Baltay ◽  
Julian Bunn ◽  
...  
Keyword(s):  
Early Warning ◽  
Earthquake Early Warning ◽  
Earthquake Sequence

TIME SERIES DISPLACEMENT MAPS FOR THE 2019-2020 PUERTO RICO EARTHQUAKE SEQUENCE

2020 ◽  
Author(s):  
Zelalem Demissie ◽  
◽  
Daniel A. Laó-Dávila ◽  
Liang Xue ◽  
Glyn Rimmington ◽  
...  
Keyword(s):  
Time Series ◽  
Puerto Rico ◽  
Earthquake Sequence ◽  
Displacement Maps

Supplemental Material: Geophysical analysis of the 30 July 1972 Sitka, Alaska, earthquake sequence

2020 ◽  
Author(s):  
Juan A. Ochoa Chavez ◽  
Diane Doser
Keyword(s):  
Earthquake Sequence ◽  
Double Difference ◽  
Alaska Earthquake

Supplemental Material 1 contains relocated aftershocks of 30 July 1972 sequence. Supplemental Material 2 contains relocation parameters used in double-difference algorithm (HYPODD).<br>

The Norris Lake Earthquake Swarm of June Through September, 1993; Preliminary Findings

1994 ◽  
Vol 65 (2) ◽  
pp. 167-171 ◽  
Author(s):  
L.T. Long ◽  
A. Kocaoglu ◽  
R. Hawman ◽  
P.J.W. Gore
Keyword(s):  
Earthquake Swarm ◽  
Building Stone ◽  
Aftershock Sequence ◽  
Average Depth ◽  
Induced Earthquakes ◽  
Epicentral Area ◽  
Event Recorder ◽  
Significant Damage ◽  
The 1950S ◽  
Recreational Lake

Abstract During the summer of 1993, the residents in the Norris Lake community, Lithonia, Georgia, were bothered by an incessant swarm of earthquakes. The largest, a magnitude 2.7 on September 23, showed a normal aftershock decay and occurred after the main swarm. Over 10,000 earthquakes have been detected, of which perhaps 500 were felt. The earthquakes began June 8, 1993, with a 5-day swarm. The residents, accustomed to quarry explosions, suspected the quarries of irregular activities. To locate the source of the events, a visual recorder and a digital event recorder were placed in the epicentral area. Ten to 20 events were detected per day for the next three weeks. The swarm then escalated to a peak of over 100 per day by August 15, 1993. Activity following the peak died down to about 10 events per day. The magnitude 2.7 event of September 23 was followed by a normal aftershock sequence. The larger events were felt with intensity V within 2 km of their epicenter, and noticed (intensity II) to a distance of 15 km. Some incidents of cracked wallboard and foundations have been reported, but no significant damage has been documented. Preliminary locations, based on data from digital event recorders, suggest an average depth of 1.0 km. The hypocenters are in the Lithonia gneiss, a massive migmatite resistant to weathering and used locally as a building stone. The epicenters are 1 to 2 km south-southwest of the Norris Lake Community. The cause of the seismicity is not yet known. The earthquakes are characteristic of reservoir-induced earthquakes; however, Norris Lake is a small (96 acres), 2 to 5m deep recreational lake which has existed since the 1950s.

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