scholarly journals Wastewater disposal and earthquake swarm activity at the southern end of the Central Valley, California

2016 ◽  
Vol 43 (3) ◽  
pp. 1092-1099 ◽  
Author(s):  
T. H. W. Goebel ◽  
S. M. Hosseini ◽  
F. Cappa ◽  
E. Hauksson ◽  
J. P. Ampuero ◽  
...  
Keyword(s):  
Earthquake Swarm ◽  
Central Valley ◽  
Wastewater Disposal ◽  
Swarm Activity

scholarly journals Some possible correlations between electro-magnetic emission and seismic activity during West Bohemia 2008 earthquake swarm

2010 ◽  
Vol 2 (1) ◽  
pp. 145-160
Author(s):  
P. Kolář
Keyword(s):  
Seismic Activity ◽  
Earthquake Swarm ◽  
Seismic Events ◽  
Seismic Region ◽  
West Bohemia ◽  
Long Time ◽  
Electro Magnetic ◽  
Short Time ◽  
Swarm Activity

Abstract. There are long time lasting speculations about electro-magnetic emission phenomena (hereafter EME) connected with seismic activity. In the present work we study such relations in West Bohemia region during 2008 earthquake swarm. After brief characterization of the seismic region, we describe recording method and data analysis. We did not observe any direct link between EME and seismic events, however statistical analysis indicates that it could be some increase of EME activity in time 60 to 30 min before an event on periods 17–14 min, some gap in EME activity approximately 2 h after the event and a maximum 4 h after the events (note, that this result qualitatively correspond with observations from other seismic regions). Also global decrease of EME activity with the decay of the swarm activity was observed. However due to incomplete EME data and short time of observation these results must be understand as indication of possible correlation rather than reliable relation.

Statistical analysis of tidal effect on non-volcanic earthquake swarm activity in Wakayama Prefecture, southwest Japan

2021 ◽  
Author(s):  
Kazuki Machida ◽  
Hiroyuki Nagahama ◽  
Jun Muto
Keyword(s):  
Normal Stress ◽  
Earthquake Swarm ◽  
Tohoku Earthquake ◽  
Rate Variation ◽  
Volcanic Earthquake ◽  
Seismicity Rate ◽  
Tidal Forces ◽  
Tidal Triggering ◽  
Tidal Stress ◽  
Swarm Activity

<p>Earthquakes occur when the fault stress accumulates to the critical level. External forces such as tidal forces may contributes to the triggering of earthquakes reaching the critical state. For example, in the case of 2011 Tohoku Earthquake, it is reported that there is a correlation between tidal forces and the earthquakes prior to the mainshock. Earthquakes with smaller magnitude are also affected by tidal forces and expected to show correlation with tidal forces.</p><p>Tidal triggering of non-volcanic seismic swarm has not been well documented. So, we choose the Wakayama Prefecture as a targeting region. The cause of the earthquakes occurring in the region is considered to be the presence of the water below the seismogenic depth. The swarm activity continues from 1980s. We analyzed the shallow earthquakes in the northern part of Wakayama Prefecture from 1998 to 2016. We used statistical method called Schuster test to analyze correlation between earthquakes and tidal stress.</p><p>The result of the analysis shows that the earthquakes have a correlation with tidal forces which have the periodicity near the half of the lunar day and the amplitude of the seismicity-rate variation is about 16% of the average earthquake frequency. Correlation between the earthquakes and tidal forces is stronger at the periods when larger number of earthquakes occur. From tidal stress calculation, it is found that both solid tide and oceanic tide are important at this region. This study confirms that most of the earthquakes larger than M<sub>w</sub> 4 in the region occur in the rising period of tidal normal stress or just after the maximum of tidal normal stress. Therefore, tidal observation gives information about the criticality of rocks and temporal heterogeneity of the earthquake occurrence.</p>

A tectono-geomorphological perspective of micro-earthquake swarm activity prone areas around Bhavnagar and Jamnagar in Saurashtra, western India

2020 ◽  
Author(s):  
Naimisha Vanik ◽  
D.M. Maurya ◽  
Mohamedharoon Shaikh ◽  
Akash Padmalal ◽  
Prabhuti Tiwari ◽  
...  
Keyword(s):  
Earthquake Swarm ◽  
Western India ◽  
Swarm Activity

scholarly journals Revealing 60 years of Earthquake Swarms in the Southern Red Sea, Afar and the Gulf of Aden

2021 ◽  
Vol 9 ◽  
Author(s):  
Joël Ruch ◽  
Derek Keir ◽  
Luigi Passarelli ◽  
Domenico Di Giacomo ◽  
Ghebrebrhan Ogubazghi ◽  
...  
Keyword(s):  
Red Sea ◽  
Earthquake Swarm ◽  
Volcanic Eruptions ◽  
Temporal Variations ◽  
Earthquake Swarms ◽  
Plate Boundaries ◽  
Gulf Of Aden ◽  
Earthquake Catalogues ◽  
Study Region ◽  
Swarm Activity

Earthquake swarms occur sporadically at divergent plate boundaries but their recurrence over multiple decades and relation to magmatic spreading activity remain poorly understood. Here we study more than 100 earthquake swarms over a 60-year period in the southern Red Sea, Afar, and Gulf of Aden region. We first compiled an earthquake-swarm catalogue by integrating reexamined global and local earthquake catalogues from 1960 to 2017. This yielded 134 earthquake swarms that mainly cluster in 19 different areas in the study region, showing that in most cases swarms recur every few decades in the same area. The swarms exhibit a range of earthquake magnitudes and often include multiple M3 to M5 events with some swarms having occasional larger earthquakes over M6, primarily in southern Afar. Many of the earthquake swarms were clearly associated with rifting events, consisting of magmatic intrusions, surface faulting, and in some cases volcanic eruptions. Together, the swarms suggest that extension at these divergent plate boundaries occurs episodically along <100 km long segments, some of which were previously unrecognized. Within the study region, the Gulf of Aden shows the most frequent swarm activity, followed by Afar and then the southern Red Sea. The results show that the three areas were subject to an increase of earthquake-swarm activity from 2003 to 2013 in the form of three rifting episodes and at least seven volcanic eruptions. We interpret that the most likely controls on temporal variations in earthquake swarm activity are either temporal variations in magma supply, or rifting-induced stress change that trigger clusters of swarms.

Earthquake Swarm Activity in Changbaishan Tianchi Volcano

2007 ◽  
Vol 50 (4) ◽  
pp. 938-946 ◽  
Author(s):  
Jian-Ping WU ◽  
Yue-Hong MING ◽  
Heng-Rong ZHANG ◽  
Guo-Ming LIU ◽  
Li-Hua FANG ◽  
...  
Keyword(s):  
Earthquake Swarm ◽  
Tianchi Volcano ◽  
Swarm Activity

Earthquakes Induced by Wastewater Disposal near Musreau Lake, Alberta, 2018–2020

2021 ◽  
Author(s):  
Tianyang Li ◽  
Yu Jeffrey Gu ◽  
Jingchuan Wang ◽  
Ruijia Wang ◽  
Javad Yusifbayov ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Earthquake Swarm ◽  
Stress Transfer ◽  
Focal Mechanisms ◽  
Induced Earthquakes ◽  
Wastewater Disposal ◽  
Northern Rocky Mountains ◽  
Western Canada Sedimentary Basin ◽  
Induced Earthquake ◽  
Recent Earthquakes

Abstract Although hydraulic fracturing-induced earthquakes have been widely reported in Alberta, Canada, only one seismic cluster (the Cordel Field) has thus far been linked to wastewater disposal (WD). In this study, we report a statistically significant spatiotemporal correlation between recent earthquakes and nearby WD wells near Musreau Lake—the second disposal-induced earthquake swarm in Alberta. This newly occurred swarm contains five events with local magnitudes ML>3 from January 2018 to March 2020, forming into three tightly spaced clusters. The refined locations and focal mechanisms suggest a ∼10 km long northwest–southeast-trending rupture along the northern Rocky Mountains that developed over time, during which both poroelastic effects and static stress transfer played key roles. Through a statistical analysis of all reported induced earthquake clusters in the western Canada sedimentary basin (WCSB), we propose a linear predictive relationship (i.e., the “Interpolated Strike Orientation” model) between fault rupture direction and fault distance to the Rocky Mountains. This observation-based model, which is supported by both the focal mechanisms of the natural earthquakes and the nearby northwest-striking geological faults, is a new and useful reference for future assessments of seismic hazard in the WCSB.

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