THE 2016 GRAND WASH, ARIZONA EARTHQUAKE SWARM

2018 ◽  
Author(s):  
David S. Brumbaugh ◽  
Keyword(s):  
Earthquake Swarm

THE 2015 PLAINFIELD, CT EARTHQUAKE SWARM

2016 ◽  
Author(s):  
John E. Ebel ◽  
◽  
Parker W. Aubin ◽  
Justin Starr ◽  
Nawa Dahal ◽  
...  
Keyword(s):  
Earthquake Swarm

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.

scholarly journals Reflections on the L’Aquila trial and the social dimensions of disaster risk

2019 ◽  
Vol 28 (4) ◽  
pp. 434-445 ◽  
Author(s):  
Angelo Jonas Imperiale ◽  
Frank Vanclay
Keyword(s):  
Local Community ◽  
Social Issues ◽  
Local Level ◽  
Earthquake Swarm ◽  
Disaster Risk ◽  
Community Empowerment ◽  
Court Case ◽  
Civil Protection ◽  
Content Type ◽  
The Social

Purpose The purpose of this paper is to reflect on what can be learned about disaster risk reduction (DRR) from the L’Aquila trial of scientists. The court case was initiated because of a controversial meeting on 31 March 2009 of the Major Risks Committee (MRC), held under the auspices of the Italian Department of Civil Protection. The purpose of the meeting was to consider (prior to the fatal earthquake of 6 April 2009) disaster risk in the L’Aquila area, which was being affected by an earthquake swarm since October 2008. Design/methodology/approach The authors undertook a document analysis of trial materials, and a review of academic and media commentary about the trial. Findings The legal process revealed that disaster governance was inadequate and not informed by the DRR paradigm or international guidelines. Risk assessment was carried out only in a techno-scientific manner, with little acknowledgement of the social issues influencing risks at the local community level. There was no inclusion of local knowledge or engagement of local people in transformative DRR strategies. Originality/value Most previous commentary is inadequate in terms of not considering the institutional, scientific and social responsibilities for DRR as exposed by the trial. This paper is unique in that it considers the contents of the MRC meeting as well as all trial documents. It provides a comprehensive reflection on the implications of this case for DRR and the resilience of peoples and places at risk. It highlights that a switch from civil protection to community empowerment is needed to achieve sustainable outcomes at the local level.

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 Aseismic deformation associated with an earthquake swarm in the northern Apennines (Italy)

2017 ◽  
Vol 44 (15) ◽  
pp. 7706-7714 ◽  
Author(s):  
A. Gualandi ◽  
C. Nichele ◽  
E. Serpelloni ◽  
L. Chiaraluce ◽  
L. Anderlini ◽  
...  
Keyword(s):  
Earthquake Swarm ◽  
Northern Apennines ◽  
Aseismic Deformation

The West Bohemian 2008-earthquake swarm: When, where, what size and data

2009 ◽  
Vol 53 (3) ◽  
pp. 351-358 ◽  
Author(s):  
Josef Horálek ◽  
Tomáš Fischer ◽  
Alena Boušková ◽  
Jan Michálek ◽  
Pavla Hrubcová
Keyword(s):  
Earthquake Swarm ◽  
The West

scholarly journals Damage during the 6–24 February 2017 Ayvacık (Çanakkale) earthquake swarm

2018 ◽  
Vol 18 (3) ◽  
pp. 921-934 ◽  
Author(s):  
Ramazan Livaoğlu ◽  
Mehmet Ömer Timurağaoğlu ◽  
Cavit Serhatoğlu ◽  
Mahmud Sami Döven
Keyword(s):  
Earthquake Swarm ◽  
Structural Features ◽  
Load Bearing Capacity ◽  
Distribution Maps ◽  
Mortar Strength ◽  
Development Level ◽  
Out Of Plane ◽  
Connection Type ◽  
Past Experiences ◽  
Construction Practice

Abstract. On 6 February 2017 an earthquake swarm began at the western end of Turkey. This was the first recorded swarm in the Çanakkale region since continuous seismic monitoring began in 1970. The number of earthquakes located increased during the following 10 days. This paper describes the output of a survey carried out in the earthquake-prone towns in the area of Ayvacık, Çanakkale, Turkey, in February 2017 after the earthquakes. Observations of traditional buildings were made on site at the rural area of Ayvacık. A description of the main structural features and their effects on the most frequently viewed damage modes were made according to in-plane, out-of-plane behavior of the wall regarding construction practice, connection type, etc. It was found that there were no convenient connections like cavity ties or sufficient mortar strength resulting in decreased and/or lack of lateral load bearing capacity of the wall. Furthermore, distribution maps of damaged/undamaged buildings according to villages, damage ratios, structures and damage levels are generated. Distribution maps showed that damage ratio of structures is higher in villages close to epicenter and decrease away from epicenter except Gülpınar, where past experiences and development level affect the construction quality.

Approximate method to estimate the short-period strong motion spectra on bedrock

1981 ◽  
Vol 71 (2) ◽  
pp. 491-505
Author(s):  
Katsuhiko Ishida
Keyword(s):  
Earthquake Swarm ◽  
Strong Motion ◽  
Fourier Amplitude ◽  
Period Range ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Short Period ◽  
Amplitude Spectra ◽  
Low Pass ◽  
Parkfield Earthquake

abstract The methodology to estimate the strong motion Fourier amplitude spectra in a short-period range (T ≦ 1 to 2 sec) on a bedrock level is discussed in this paper. The basic idea is that the synthetic strong motion Fourier spectrum F˜A(ω) calculated from smoothed rupture velocity model (Savage, 1972) is approximately similar to that of low-pass-filtered strong earthquake ground motion at a site in a period range T ≧ 1 to 2 sec: F˜A(ω)=B˜(ω)·A(ω). B˜(ω) is an observed Fourier spectrum on a bedrock level and A(ω) is a low-pass filter. As a low-pass filter, the following relation, A ( T ) = · a · T n a T n + 1 , ( T = 2 π / ω ) , is assumed. In order to estimate the characteristic coefficients {n} and {a}, the Tokachi-Oki earthquake (1968), the Parkfield earthquake (1966), and the Matsushiro earthquake swarm (1966) were analyzed. The results obtained indicate that: (1) the coefficient {n} is nearly two for three earthquakes, and {a} is nearly one for the Tokachi-Oki earthquake, eight for the Parkfield earthquake, and four for the Matsushiro earthquake swarm, respectively; (2) the coefficient {a} is related with stress drop Δσ as (a = 0.07.Δσ). Using this relationship between {a} and Δσ, the coefficients {a} of past large earthquakes were estimated. The Fourier amplitude spectra on a bedrock level are also estimated using an inverse filtering method of A ( T ) = a T 2 a T 2 + 1 .

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