Catégorie : Earthquakes

Relocated seismicity 2000-2015

This relocated catalog has been obtained by Clara Duverger  (Duverger , 2017; Duverger et al., 2018) from double difference relocation (HypoDD) based on both  P and S catalog and cross correlation phases.

Maps of original and relocated earthquakes. (a) Map of selected earthquakes for the relocation
(n~115,000) from 2000 to 2015, recorded by 4 or more stations (triangles) with at least 6 picked phases. These events are plotted at their original location obtained with hypo71. (b) Map of the relocated earthquakes (n~94 000) computed with hypoDD. Dot size is proportional to the magnitude.
 

LINK TO RELOCATED CATALOG

 


Earthquake catalogs and seismicity maps

  • Earthquake catalogs are based on automatic detection and picking. Magnitudes Mw and Ml are also computed automaticaly. Locations are calculated in the 1D velocity model of Rigo et al. (1996) using hypo71 location code. Mw and Ml are calculated using SourceSpec (Satriano, 2020)

Rigo, A., H. Lyon-Caen, R. Armijo, A. Deschamps, D. Hatzfeld, K. Makropoulos, P. Papadimitriou, and I. Kassaras (1996), A microseismic study in the western part of the Gulf of Corinth (Greece) : Implications for large-scale normal faulting mechanisms, Geophys. J. Int., v. 126(3), pp. 663-688.

Satriano, C. (2020) SourceSpec-Earthquake source parameters from S-wave displacement spectra. DOI: 10.5281/ZENODO.3688587

  • Format of catalogs is as follows: year, month, day, hour, minute, seconds, latitute, longitude, depth, Mw, Ml, erx, ery, erz, rms, number of P phases, number of S phases, quality (according to hypo71)
  •  Seismicity maps: quality A events (best ones) are in dark red, quality B in red, quality C in orange and quality D (low reliability) in yellow... Size is proportional to seismic moment.
cat_2022_Mw cat_2021_Mw cat_2020_Mw
cat_2019_Mw cat_2018_Mw cat_2017_Mw
cat_2016_Mw cat_2015_Mw cat_2014_Mw
cat_2013_Mw cat_2012_Mw cat_2011_Mw
cat_2010_Mw cat_2009_Mw cat_2008_Mw
cat_2007_Mw cat_2006_Mw cat_2005_Mw
cat_2004_Mw cat_2003_Mw cat_2002_Mw
cat_2001_Mw

cat_2000_Mw

Continuer la lecture de « Earthquake catalogs and seismicity maps »

Mw=6.4 June 8, 2008 Movri earthquake

This earthquake ruptured 30 km of a NNE right lateral strike slip fault south of the city of Patras. No rupture was observed at the surface and slip is concentrated between 25 to 10 km depth.

patras_web_g

1964-2009 seismicity recorded by the National Observatory of Athens (red dots before 08/06/08, orange dots after)

Geodetic measurement of an already mesured network in the area has been performed just after the earthquake. OASP, University of Patras, ITSAK, university of Athens and french team installed 15 seismological in the epicentral area in order, in particular, to monitor the northern part of the rupture area near the city of Patras.

 

 

2010 Efpalio earthquakes

Monitoring of the Mw=5.3 Efpalio (Fokida) event and associated seismic crisis

The Mw=5.3 Efpalio (Fokida) event of January 18 2010 occured within CRL network, at a depth of 6-10 km, on the northern coast of the gulf. This event is followed by an unusal series of strong events, among them a Mw=5.2 on January 22.

It is not clear yet wether this normal faulting event is caused by slip on a north or south dipping fault.

- Seismology: Real time seismicity from CRL. Special page on EMSC.

Teams from University of Patras and INSU have been densifying the network around the hypocenter. Contacts: Thimios Sokos (Univ. Patras), Pascal Bernard (IPGP), Hélène Lyon-Caen (ENS), Anne Deschamps (GeoAzur). Pascal Bernard and Pierre Dublanchet are in the area from Saturday 23 to Wednesday 27.

- Geodesy: Teams from the University of Patras and INSU are installing temporary permanent GPS stations (10Hz sampling rate) and will remeasure points M, I, H of the network where the latest measurements were made in 2006 and 2008. A permanent GPS station of CRL, (EYPA), is near the centre of the crisis area. Contacts: Stathis Stiros (Univ. Patras), Pierre Briole (ENS), Antonio Avallone (INGV)

- Radar interferometry: Teams from the National Observatory of Athens, the University of Patras and INSU will gather the latest ALOS and ENVISAT acquisitions and produce interferograms as soon as new images are aquired. Information about the crisis has been sent to ESA. Contacts: Panagiotis Elias (NOA), Pierre Briole (ENS), Vassilis Anastasopoulos (Univ. Patras)

- Electro-magnetism: A team from INSU (Jacques Zlotnicki and Paul Yvetot, arrival on Tuesday 26) will install additional magnetometer stations. Contact: Jacques Zlotnicki (Univ. Clermont-Ferrand),