The 8 June 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Western Greece: A Case of Fault Reactivation in an Overpressured Lower Crust?

Konstantinou, K. I.; Evangelidis, Christos; Melis, Νikolaos S.

doi:10.1785/0120100074

Cited by 20 publications

(31 citation statements)

References 37 publications

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“…The strike of the fault is 210o as determined by seismological means (Konstantinou et al, 2009). Konstantinou et al (2011) performed a stress inversion of all available focal mechanisms in the area and estimated that the principal compressive stress axis of the regional stress field has an azimuth of ~273o (see Fig.4). The angle between the strike of the fault and the σ1 of the regional stress field shows that the fault is severely misoriented compared to the regional prevailing stress field.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…Konstantinou et al (2011) suggested that the presence of fluids may have facilitated the reactivation of the fault causing the 2008 event. Fluids could have allowed the fault to slip by rotating the principal stress axis locally around the fault to more favorable angles.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…For instance, Konstantinou et al (2011) made use of a database of helium isotope measurements around Greece and surroundi ng areas compiled by Pik and Marty, (2009). One such measurement taken at a location about 20 k m away from the earthquake's epicentre, shows a significant percentage (7%) of mantle helium.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…These low Pn velocities may represent molten ar eas in the upper mantle that can be considered as possible sources of degassing fluids. Fluids are lo wer crust or upper mantle sourced and possibly the relatively permeable and fractured fault zone ac ted as passage way (Konstantinou et al, 2011). The fast polarization directions are usually parallel or sub-parallel to the present-day direction of the maximum compressive stress throughout the crust (Crampin and Lovell, 1991).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…Konstantinou et al, (2011) suggested that the presence of over-pressured fluids of deep origin might have been responsible for the elevated fluid pressure levels near the hypocenter that led to the reactivation of the unknown fault that generated this event.…”

Section: Introductionmentioning

confidence: 99%

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The Crustal Anisotropy Pattern in the Epicentral Area of the 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Greece

et al. 2017

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Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Crustal Anisotropy Pattern in the Epicentral Area of the 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Greece

et al. 2017

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Present‐day crustal stress field in Greece inferred from regional‐scale damped inversion of earthquake focal mechanisms

et al. 2017

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In this study we utilize regional and teleseismic earthquake moment tensor solutions in order to infer the contemporary crustal stress in the Greek region. We focus on crustal earthquakes and select only solutions with good waveform fits and well‐resolved nodal planes. A data set of 1614 focal mechanisms is used as input to a regional‐scale damped stress inversion algorithm over a grid whose node spacing is 0.35°. Several resolution and sensitivity tests are performed in order to ascertain the robustness of our results. Our findings show that for most of the Greek region the largest principal stress σ1 is vertically oriented and that the minimum principal stress axis σ3 are subhorizontal with a predominant N‐S orientation. In the SW Peloponnese the orientation of σ3 axes rotates clockwise and in SE Aegean counterclockwise. These results are in agreement with the generally accepted model that slab rollback combined with gravitational spreading of the Aegean lithosphere are the main causes of the extension. Transitions between different faulting types in NW Greece or in the Aegean occur within narrow zones in the order of tens of kilometers. A visual comparison of the principal horizontal stress axes and the principal strain axes derived from GPS observations shows good agreement, suggesting that the crust in the Greek region behaves largely in an elastic manner.

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Simulation of strong ground motion on near-fault rock outcrop for engineering purposes: the case of the city of Xanthi (northern Greece)

Roumelioti

Kiratzi

Margaris

et al. 2016

Bull Earthquake Eng

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We combine probabilistic and deterministic approaches in an attempt to tackle a challenging topic in engineering seismology, that of the prediction of strong ground motion in urban areas located close to active faults, with sparse modern seismicity. The case we study is the city of Xanthi in northern Greece and we generate bedrock synthetic time series to be used as input motions into site-specific site effect analysis. We re-assess the seismic hazard using the probabilistic method and then perform hazard deaggregation in order to define realistic earthquake scenarios, which we examine in a deterministic way. The scenarios examined are: (a) a reference earthquake of M6.7, return period 100 years and at *30 km distance from the city and (b) a reference earthquake of M5.8, return period 475 years and at *3 km distance from the city of Xanthi. To compute synthetic time series for the distant source, we apply the stochastic method for finite faults. For the near-fault earthquake scenario we adopt a hybrid deterministic-stochastic approach that includes the semi-analytical method implemented in the COMPSYN code for the low frequency (*\3 Hz) part of the spectrum and the stochastic method for the high-frequency (*[3 Hz). The results of the probabilistic and the deterministic approaches converge to a satisfactory degree.

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The 8 June 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Western Greece: A Case of Fault Reactivation in an Overpressured Lower Crust?

Cited by 20 publications

References 37 publications

The Crustal Anisotropy Pattern in the Epicentral Area of the 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Greece

The Crustal Anisotropy Pattern in the Epicentral Area of the 2008 Mw 6.4 Earthquake in Northwest Peloponnese, Greece

Present‐day crustal stress field in Greece inferred from regional‐scale damped inversion of earthquake focal mechanisms

Simulation of strong ground motion on near-fault rock outcrop for engineering purposes: the case of the city of Xanthi (northern Greece)

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