Waveform Relocation and Focal Mechanism Analysis of an Earthquake Swarm in Trichonis Lake, Western Greece

Evangelidis, Christos; Konstantinou, K. I.; Melis, Νikolaos S.; Charalambakis, M.; Stavrakakis, G.

doi:10.1785/0120070185

Cited by 25 publications

(27 citation statements)

References 18 publications

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“…These are similar to results obtained by Evangelidis et al (2008) and Kiratzi et al (2008). Thus, as seen in Fig.1, the seismicity is constrained mainly in the eastern part of the lake bounded by two NW-SE normal faults while there are only a few events to the west that could be correlated to the main EW trending Trichonis lake fault.…”

Section: Datasupporting

confidence: 87%

“…The main events of the sequence were not recorded by the microseismic network, thus we have included in the top left panel of Fig. 5 the location provided by Kiratzi et al (2008) and Evangelidis et al (2008) for the strongest one (star and square in top left panel of Fig. 5).…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless this fault didn't rapture during the earthquake sequence under study, as suggested by Evangelidis, 2008 andKiratzi et al, 2008. The causative fault of this sequence strikes NNW-SSE and controls the topography of the lake at its eastern part, probably acting as a transfer fault that links the Trichonics lake with Corinth gulf (Melis et al, 1989).…”

Section: Geological -Tectonic Settingmentioning

confidence: 98%

“…The seismic activity continued for more than a month with smaller events. Research studies for this sequence have been published by Evangelidis, 2008 andKiratzi, 2008. Both papers use regional data to study the characteristics of the seismic sequence, to correlate it with another series of earthquakes that occurred in the 70's in the same area and to identify the causative fault.…”

Section: Introductionmentioning

confidence: 99%

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The April 2007 Swarm in Trichonis Lake Using Data From a Microseismic Network

et al. 2017

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Section: Datasupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Geological -Tectonic Settingmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The April 2007 Swarm in Trichonis Lake Using Data From a Microseismic Network

et al. 2017

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“…Most of the aftershocks have hypocentral depths comparable to the mainshock and in the range between 15 and 25 km. We estimate uncertainties for these relative locations using a bootstrap technique where random errors (drawn from a normal distribution) are added to the picks and each event is relocated 200 times (see Shearer, 1997;Evangelidis et al, 2008). This procedure will result in a cloud of locations for whose horizontal and vertical scatter can be used in order to estimate errors.…”

Section: Earthquake Relocationmentioning

confidence: 99%

Rupture Process and Aftershocks Relocation of the 8 June 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Western Greece

Konstantinou¹,

Melis²,

Lee³

et al. 2009

Bulletin of the Seismological Society of America

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On 8 June 2008 at 12:25 (GMT) an M w 6.4 strong earthquake occurred in the area of northwest Peloponnese, western Greece, causing the death of two people and extensive damage to the surrounding area. The main event and its aftershocks were recorded by one nationwide and three regional networks equipped with threecomponent broadband seismometers. Initial locations of the earthquake sequence comprising 438 aftershocks showed a linear northeast-southwest trend and that the mainshock was located at 22 km depth. After the relocation using catalog and differential travel times, most events form three distinct clusters at depths 15-25 km. Moment tensor solutions for the main event and its largest aftershocks exhibited a pure strike-slip mechanism with one nodal plane orientated northeast-southwest in accordance with the relocated seismicity. A parallel, nonnegative least-squares inversion technique utilizing multiple-time windows was used to derive the spatiotemporal slip distribution of the main event. The resulting slip distribution model revealed a large slip patch (maximum slip ∼150 cm) between 10 and 20 km depth at the northeast part of the fault that also coincides with the area that suffered most of the damage. Another patch exhibiting smaller amounts of slip (20-50 cm) is located to the southwest direction at the same depth range, and smaller patches exist at 25-30 km depth. Most aftershocks are located in areas of low slip (< 25 cm) filling the regions of slip deficit. The 8 June earthquake occurred at an area where no previous seismological or other observations indicated the existence of a seismogenic fault at that depth and with this strike. This, and the fact that the event nucleated in the middle to lower crust, may be interpreted as the reactivation of a fault structure that was inherited from previous tectonic phases.Online Material: Spatiotemporal evolution of the aftershock sequence of the 8 June 2008 mainshock, sensitivity tests to the mainshock slip inversion, color versions of figures, relocated aftershocks catalog, classification scheme for the moment tensor solutions, and moment tensor inversion description.

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Strain and rotation rate patterns of mainland Greece from continuous GPS data and comparison between seismic and geodetic moment release

2015

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We processed data from~100 continuous GPS stations to provide new insights into the crustal motion and deformation of central and western Greece. We used the derived velocity field to evaluate two-dimensional strain and rotation rate tensors, and we mapped the dilatation and maximum shear strain rates. In central Peloponnese and Epirus, we documented a 90°switch in the extension direction, which can be explained on the basis of the plate boundary configuration. Evidence for an extended deformation pattern in central Greece was found. Additionally, we detected two pairs of shear belts, one in Akarnania-NW Peloponnese and one in North Aegean. We delineated two rotational domains that dominate the present-day pattern. Moreover, we saw no geodetic evidence for North Anatolian Fault growth toward central Greece. We translated the geodetic strain rates into rates of seismic moment release and compared them with earthquake catalog-based moment rates. In the central Ionian Sea, the geodetic strain is completely released seismically, which is indicative of a fully coupled seismogenic zone. However, for most of the study area, the geodesy-based moment rates are at least 2 times higher than the earthquake-based rates. We attribute this mainly to earthquake catalog representativity over the long-term situation. However, for the Gulf of Corinth, it is unrealistic to associate the high ratio of geodetic to seismic moment rates only to incompleteness of the earthquake catalog; instead, long-term aseismic deformation must be an important mechanism accommodating a considerable portion of the strain budget, especially at its western part.

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Waveform Relocation and Focal Mechanism Analysis of an Earthquake Swarm in Trichonis Lake, Western Greece

Cited by 25 publications

References 18 publications

The April 2007 Swarm in Trichonis Lake Using Data From a Microseismic Network

The April 2007 Swarm in Trichonis Lake Using Data From a Microseismic Network

Rupture Process and Aftershocks Relocation of the 8 June 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Western Greece

Strain and rotation rate patterns of mainland Greece from continuous GPS data and comparison between seismic and geodetic moment release

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