20 February 1743 earthquake

Sequence of earthquakes lasting 21 months (until the mainshock) with:

  • 23 June 1741 Cephalonia (Argostoli, Assos, Valsamata, Lixouri)


  • 25 February 1742 Zakynthos M=6.4

Large damages at Zakynthos, 120 people killed, ref Barbiani & Barbiani, 1864, Albini et al., 1995, Chiotes 1886-87


  • 20 February 1743 Lefkada, Corfu M=6.8

Major damages at Francavilla Fontana and Nardo (Italy) and in Lefkada. Serious damages at Brindisi, Taranto, Bari, in the north of Cephalonia, Ioannina. Duration in Zakynthos = 2mn

Ref Perrey, 1848, Mallet, 1848, Aravantinos, 1856, Partsch, 1887, Machaeras, 1951, Montadon, 1953, Triantafyllou, 1959, Tsitseles, 1960


  • June 1745 Corfu M=6.5

Destructions in Corfou, strongly felt up to Cephalonia

Selection of earthquakes for WHATsun

  • 25 October 2018 M=6.8 Zakynthos
  • 17 November 2015 M=6.4 Lefkada
  • 1 July 2009 M=6.4 Crete
  • 14 February 2008 M=6.9 Methoni
  • 15 June 1995 M=6.2 Aigion
  • 17 January 1983 M=7.2 Cephalonia
  • 24 February 1981 M=6.7 Corinth
  • 6 July 1965 M=6.3 Eratini-Galaxidi
  • 7 February 1963 landslide Aigion
  • 12 August 1953, M=7.2 Cephalonia
  • 22 April 1948 M=6.5 Ionian sea
  • 22 April 1928 M=6 Corinth
  • 4 February 1867, M=7.4 Cephalonia
  • 20 September 1867 M=7.1 Mani
  • 6 January 1821 M=6.5 Ionian sea
  • 29 December 1820 M=6.9 Zakynthos
  • 14 May 1748 M=6.8 Corinth & Patras gulf
  • 20 February 1743 M=6.8 Corfu
  • 5 November 1633 M=6.9 Zakynthos
  • 5 May 1622 M=6.6 Zakynthos
  • April 551 M=7.1 Etolia
  • 21 July 365 M=8 Crete
  • -373 M=7.3 Corinth & Patras gulf
  • June -426 M=7.1 Corinth & Patras gulf

CRL portal facts 2017-2019

The statistics below are those of early november 2019
Click on the figures to enlarge


Figure 1. Daily number of visitors. The peaks are in september (during the CRLSchools) and in june (during the coordination meetings of the NFO).


Figure 2. Monthly number of visitors. 


Figure 3. Evolution of the monthly number of returning visitors.  The returning visitors represent 16.9% of the total number of visitors. Not considering the peaks of June and September (see Fig. 1), there is a positive long term trend passing from ~30 returning visitors/month in early 2017 to ~60 returning visitors/month in late 2019. The present (november 2019) 60/month might be a reasonably good measurement of the current number of routine users of data and products distributed through the CRL web portal (see pages most visited in Fig. 5).


Figure 4. Country of the visitor. Greece is by far the top user of the CRL NFO web portal.


Figure 5. Pages most visites. The home page http://crlab.eu is the most visited with 26%. The three CRLSchools 2019, 2018 and 2017 gather in total 17.4%. The data/products pages most visited are those with 30s GNSS data, earthquakes catalogs, and interferograms.


Figure 6. Duration of the session. Apart the very short visits, the peak visit time is in the range 3-10mn.


Figure 7. Type of interface. The CRL portal is compatible with smartphones and tablets. This is useful in particular to navigate whith the GPS of the smartphone to the stations in the field (see for example here for navigation to the seismic stations). The connections with smartphones account currently for ~19%.




CRL coordination meeting 2019

National and Kapodistrian University of Athens, June 19, 2019

Download report version 20191025a

Download minutes version 20191025a


  • (A) 10:00-10:10 Welcome by the rector office of the NKUA

  • (B) 10:20-10:30 Brief overview of the activity of the Observatory from June 2018 to June 2019 and introduction of the working programme of the day
  • (C) 10:30-11:15 Field and telemetry infrastructure
  • (D) 11:15-11:45 Raw data management & data/products
  • (E) 11:45-12:00 Break
  • (F) 12:00-12:45 Products workflow and management. Distribution of tasks abong partners for the various data processings, quality control (internal and cross-quality-control within the team)
  • (G) 12:45-13:30 Web portal, interface(s) for communication, data and products, compliance with the EPOS formats for data and products
  • (H) 13:30-14:30 Lunch break
  • (I) 14:30-15:15 Governance and funding of the Observatory, scientific council, administrative issues
  • (J) 15:15-16:00 Students exchanges among partners universities, educational and outreach component of the Observatory
  • (K) 16:00-16:30 Conclusions and planned actions for the fortcoming months and until the June 2020 meeting

Other supporting documents

Direct link to files repository




Free software and educational resources

Free software distributed by the space agencies

Free software useful at CRL for mapping

On-line GNSS processing resources

Free and educational sofware for remote sensing

Free and educational software for seismology

Free programming software

The CRL GitHub