Microseismicity in the mid-St. Lawrence Valley Charlevoix zone, Québec

1981 ◽  
Vol 71 (5) ◽  
pp. 1553-1560
Author(s):  
F. Anglin ◽  
G. Buchbinder
Keyword(s):  
Active Region ◽  
Active Zone ◽  
Seismic Activity ◽  
Normal Faults ◽  
Impact Structure ◽  
Cumulative Data ◽  
Definition Of ◽  
Detailed Picture ◽  
Hypocentral Distribution ◽  
Definite Correlation

abstract Previous seismicity studies of the Charlevoix zone of the mid-St. Lawrence Valley have defined the extent of the active zone. Continued monitoring of this zone has yielded more hypocenters that, together with the previous data, give a more detailed picture of the hypocentral distribution of the microactivity. A more definite correlation can now be made with the known structure in this region and the faults of the St. Lawrence VAlley in general. The cumulative data permit a definition of lateral boundaries of the seismic activity, range of focal depths, and anomalous nonseismic zones. It is also possible to make a correlation with the normal faults that were probably associated with the paleorifting of the St. Lawrence Valley but are now under compression. In this seismically active region, part of these preexisting partially sealed faults were most likely weakened again at the time of formation of the Charlevoix impact structure.

scholarly journals Seismicity and development of Romashkino hydrocarbon field’s Almetyevskaya area

Georesursy ◽  
2021 ◽  
Vol 23 (4) ◽  
pp. 51-57
Author(s):  
Igor Ognev ◽  
Alexey Stepanov
Keyword(s):  
Human Activities ◽  
Active Zone ◽  
Seismic Activity ◽  
The South ◽  
South Eastern ◽  
Hydrocarbon Fields ◽  
The Relationship ◽  
Hydrocarbon Field

The relationship between the various human activities and seismic activity has become more evident in the last several decades. One of the important domains where such a relationship manifests itself is hydrocarbon fields’ development. South East Tatarstan (Russia) is a region where the link between seismicity and the development of the giant Romashkino hydrocarbon field has been established. The goal of the current study is to conduct the causative analysis between the seismic activity and the development of the Romashkino hydrocarbon field’s Almetyevskaya area which is located in the most seismically active zone of the south-eastern Tatarstan.

Active sediment creep deformation on a deep-sea terrace in the Japan Trench

2018 ◽  
Vol 158 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Sayaka Nitta ◽  
Takafumi Kasaya ◽  
Kiichiro Kawamura
Keyword(s):  
Active Region ◽  
Creep Deformation ◽  
Deep Sea ◽  
Japan Trench ◽  
Normal Faults ◽  
Tectonic Erosion ◽  
Active Folds ◽  
Sequence Unit ◽  
Water Depths ◽  
Rising Sea Level

AbstractEighty-six new acoustic survey lines along and across the Japan Trench revealed active sediment creep deformation on a deep-sea terrace at water depths of 400–1200 m in an area of arcuate-shaped depressions that are probably associated with tectonic erosion. The most active region of creep is located on the top at the surface of the depression south of 38° N. The area of creep deformation is characterized by arcuate-shaped topographic lineaments with active folds and active normal faults stepping down trenchward. In contrast to the southern region, normal faults at the top of the depression north of 38° N cut a sedimentary sequence (Unit 1) that is acoustically transparent with continuous weak reflectors, and this is covered by the undeformed layered sediment sequence of Unit 2. Unit 2 corresponds to the period of rising sea level that extended from the latest Pleistocene to the early Holocene (14–6 ka). Thus, creep is ongoing at the top of the depression south of 38° N in the surface layer, whereas it stopped north of the depression between 14 and 6 ka. These observations might indicate that the active region jumped from north to south due to probably retrogressive sliding.

scholarly journals Study of self potential anomalous fluctuations in a seismic active zone of Lucano Apennine (southern Italy): recent results

2008 ◽  
Vol 8 (5) ◽  
pp. 1099-1104 ◽  
Author(s):  
G. Colangelo ◽  
V. Lapenna ◽  
L. Telesca
Keyword(s):  
Active Zone ◽  
Seismic Activity ◽  
Southern Italy ◽  
Complex Nature ◽  
Stress And Strain ◽  
Geophysical Monitoring ◽  
Time Period ◽  
Long Time ◽  
Self Potential ◽  
Apennine Chain

Abstract. Geoelectrical fluctuations measured in seismic areas have been attributed to stress and strain changes, associated with earthquakes. The complex nature of this problem has suggested the development of monitoring stations in order to perform geophysical monitoring for a long time period and with a high sample rate. In this paper, anomalous geoelectrical fluctuations of SP signals recorded in the S. Loja basin, Lucano Apennine chain by Tito and Picerno stations, and linked with seismic activity, are analyzed and discussed.

scholarly journals Seismically active area monitoring by robust TIR satellite techniques: a sensitivity analysis on low magnitude earthquakes in Greece and Turkey

2005 ◽  
Vol 5 (1) ◽  
pp. 101-108 ◽  
Author(s):  
R. Corrado ◽  
R. Caputo ◽  
C. Filizzola ◽  
N. Pergola ◽  
C. Pietrapertosa ◽  
...  
Keyword(s):  
Seismic Activity ◽  
Active Regions ◽  
Space Time ◽  
Data Sets ◽  
Earthquake Occurrence ◽  
Validation Data ◽  
Analysis Technique ◽  
Definition Of ◽  
Area Monitoring ◽  
Low Magnitude

Abstract. Space-time TIR anomalies, observed from months to weeks before earthquake occurrence, have been suggested by several authors as pre-seismic signals. Up to now, such a claimed connection of TIR emission with seismic activity has been considered with some caution by scientific community mainly for the insufficiency of the validation data-sets and the scarce importance attached by those authors to other causes (e.g. meteorological) that, rather than seismic activity, could be responsible for the observed TIR signal fluctuations. A robust satellite data analysis technique (RAT) has been recently proposed which, thanks to a well-founded definition of TIR anomaly, seems to be able to identify anomalous space-time TIR signal transients even in very variable observational (satellite view angle, land topography and coverage, etc.) and natural (e.g. meteorological) conditions. Its possible application to satellite TIR surveys in seismically active regions has been already tested in the case of several earthquakes (Irpinia: 23 November 1980, Athens: 7 September 1999, Izmit: 17 August 1999) of magnitude higher than 5.5 by using a validation/confutation approach, devoted to verify the presence/absence of anomalous space-time TIR transients in the presence/absence of seismic activity. In these cases, a magnitude threshold (generally M<5) was arbitrarily chosen in order to identify seismically unperturbed periods for confutation purposes. In this work, 9 medium-low magnitude (4<Mb<5.5) earthquakes which occurred in Greece and Turkey have been analyzed in order to verify if, even in these cases, anomalous TIR transients can be observed. The analysis, which was performed using 8 years of Meteosat TIR observations, demonstrated that anomalous TIR transients can be observed even in the presence of medium-low magnitude earthquakes (4<Mb<5.5). As far as the research (just started) of possible correlation among TIR anomalies and earthquake occurrence is concerned, such a result suggests that: a) in order to identify seismically unperturbed periods for confutation purposes, a magnitude threshold (at least) lower than 4 should be used; b) the proposed validation/confutation approach should be applied in low-seismicity areas in order to find suitably long seismically quiescent periods.

scholarly journals 1881 and 1949 earthquakes at the Chios-Cesme Strait (Aegean Sea) and their relation to tsunamis

2005 ◽  
Vol 5 (5) ◽  
pp. 717-725 ◽  
Author(s):  
Y. Altinok ◽  
B. Alpar ◽  
N. Özer ◽  
C. Gazioglu
Keyword(s):  
Seismic Activity ◽  
Aegean Sea ◽  
Normal Faults ◽  
Natural Phenomena ◽  
Sea Waves ◽  
The South ◽  
Izmir Bay ◽  
Moderate Size ◽  
The North ◽  
Narrow Bays

Abstract. The most earthquake-prone areas in the eastern central Aegean Sea are the Izmir Bay, the Karaburun peninsula and the island of Chios. The level of seismic activity and tsunami potential are influenced by the presence of normal faults around the region. There have been about 20 moderate-size earthquakes from 496 BC to 1949 AD. Among these earthquakes, the ones on the dates 20 March 1389, 13 November 1856, 19/22 January 1866, 3 April 1881 and 23 July 1949 produced tsunamis. The Chios-Cesme earthquake (1881, Mw 6.5) took place in the South of the Cesme strait while the Chios-Karaburun earthquake (1949, Mw 6.7) occurred in the North. The tsunamis caused by the earthquakes affected the coasts of Chios Island and Cesme. These waves are thought to be associated with the earthquakes and co-seismic underwater failures possibly occurred along the coasts of the Chios Island and Karaburun Peninsula or on the complex subaqueous morphology between these lands. Some sea waves or oscillations observed following the aftershocks are believed to be related to other natural phenomena; e.g. the seiches occurred mainly in open-narrow bays as triggered by the earthquakes.

scholarly journals Lhasa seismicity during 2004-2006

2008 ◽  
Vol 38 ◽  
pp. 9-14
Author(s):  
Tsoja Wangmo ◽  
Norsang Gelsor ◽  
Jens Havskov ◽  
Nima Puntsog ◽  
Baima Tsering
Keyword(s):  
Tibetan Plateau ◽  
Active Region ◽  
Fault Zone ◽  
Seismic Activity ◽  
Measured Data ◽  
Seismic Network ◽  
The Tibetan Plateau ◽  
Seismic Region ◽  
Set Up

The Tibetan Plateau is an active seismic region due to the collision between Indian and Eurasian plates. We have set up a new seismic network in the heart of the Tibetan Plateau, in the Lhasa region, to detect seismic activities. The measured data show that Lhasa is a seismically active region where at least 716 earthquakes were detected and a total of 218 events of magnitude greater than 2.0 occurred in the period between January 2004 and July 2006. Out of them, 11 earthquakes had a magnitude greater than 5.0. A high seismic activity was observed along the Dangshung fault zone.

Inversion of argon data implies extreme extension in and below the orogenic lid of the European Alps during Eocene–Oligocene collision

2021 ◽  
Author(s):  
Gordon Lister ◽  
Marnie Forster ◽  
Jack Muston ◽  
Jason Price ◽  
Gianreto Manatschal
Keyword(s):  
High Vacuum ◽  
Temperature Drop ◽  
Shear Zones ◽  
Potassium Feldspar ◽  
Ultra High Vacuum ◽  
Normal Faults ◽  
European Alps ◽  
Diffusion Parameters ◽  
Extreme Extension ◽  
Definition Of

&lt;p&gt;Here we demonstrate conjoint inversion of data combined from &lt;sup&gt;40&lt;/sup&gt;Ar/&lt;sup&gt;39&lt;/sup&gt;Ar geochronology and ultra-high-vacuum (UHV)&amp;#160;&lt;sup&gt;39&lt;/sup&gt;Ar diffusion experiments using potassium feldspar. The method allows precise definition of diffusion parameters for a collection of domains, using an approximation to a fractal geometry. Using the MacArgon program, we could constrain possible temperature histories followed by individual mineral grains in and below the orogenic lid of the European Alps, during its history of mountain building. Tests of the sensitivity of the obtained fits provides insight into the possible range of allowed temperature-time (T-t) paths, and recognition of &amp;#8216;events&amp;#8217; during which microstructural modification may have taken place. The results suggest a sequence of abrupt cooling events, which could reflect, either: i) cycles of crustal shortening followed by detachment faulting; or ii) initial terrane-stacking beneath the orogenic lid followed by repeated rapid crustal stretching events, each event involving upward stepping of the active detachment fault. Substantial movement on low-angle normal faults and shear zones has taken place, consistent with extreme extension of the mountain belt at high-angles to the convergence direction, in front of the advancing Adriatic indentor. The magnitude of the temperature drop implies that a rapid extension event took place at the time of the Eocene&amp;#8212;Oligocene transition, and reduced the thickness of the orogenic lid to a few kilometres.&lt;/p&gt;

DEFINITION OF THE BOUNDARY OF MOSCOW'S ACTIVE ZONE OF INFLUENCE

1976 ◽  
Vol 17 (4) ◽  
pp. 270-275 ◽  
Author(s):  
V. G. Gluchkova ◽  
N. P. Shepelev
Keyword(s):  
Active Zone ◽  
Zone Of Influence ◽  
Definition Of

scholarly journals The 2013 earthquake swarm in Helike, Greece: seismic activity at the root of old normal faults

2015 ◽  
Vol 202 (3) ◽  
pp. 2044-2073 ◽  
Author(s):  
V. Kapetanidis ◽  
A. Deschamps ◽  
P. Papadimitriou ◽  
E. Matrullo ◽  
A. Karakonstantis ◽  
...  
Keyword(s):  
Seismic Activity ◽  
Earthquake Swarm ◽  
Normal Faults
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