Abstract
<p>A strong earthquake (M<sub>w</sub>=6.4) occurred in NW Peloponnesus, Greece, on June 8, 2008. The focal mechanism shows a transcurrent kinematics, and based on aftershocks distribution the causative fault is a dextral strike-slip NNE-SSW trending structure. The shock generated severe secondary environmental effects like rock-falls and liquefaction phenomena inducing structural damages and ground failures mainly along the fault strike. Evidence of liquefaction was observed in the area of Kato Achaia and Roupakia villages, while rock-falls were triggered mainly close to the epicentre at the foothills of the Skolis Mountain. Based on a quantitative methodological approach, the ground deformation and failures generated by the event have been investigated. In particular, based on an immediate post-event survey, we mapped in detail the distribution of the earthquake-induced ground failures, defining the areas prone to liquefaction and their associated potential. Moreover, a rock-fall hazard zonation in the area of Skolis Mountain has been developed based on the shadow angle approach, confirming the validity of the safety run-out distance models.</p>
Highlights
On Sunday June 8, 2008 (12:25 GMT; 15:25 local time), a strong earthquake (Mw=6.4) affected the NW Peloponnesus, Greece, inducing several earthquake environmental effects and structural damages in the broader epicentral area (Figure 1)
The most severe ground failures were concentrated within three zones; i) close to the village Kato Achaia, where liquefaction manifestations and structural damages were reported, ii) at the foothills of Skolis Mountain, where large size rock falling phenomena occurred and iii) within a zone including the villages Nisi, Psari and Neapoli, where secondary surface ruptures and damages to buildings and infrastructures were observed (Figure 3)
A catalogue of earthquake-induced ground deformation and a map showing their spatial distribution is presented in this work, while an assessment of the potential of geological hazard within two areas, Kato Achaia and Santomeri villages has been performed
Summary
On Sunday June 8, 2008 (12:25 GMT; 15:25 local time), a strong earthquake (Mw=6.4) affected the NW Peloponnesus, Greece, inducing several earthquake environmental effects and structural damages in the broader epicentral area (Figure 1). Rock-falls were observed in the area of the Fragapidima Monastery at an epicentral distance of 10 km not due to the main shock, but due to some major aftershocks [Papadopoulos et al 1994] Liquefaction related phenomena such as ejection of mixed sand and water from ground fissures with length up to 30 m and sand craters with diameters up to 50 cm were observed in the area of Spiantza, close to the river Alfios [Lekkas 1994]. The most severe ground failures were concentrated within three zones; i) close to the village Kato Achaia, where liquefaction manifestations and structural damages were reported, ii) at the foothills of Skolis Mountain, where large size rock falling phenomena occurred and iii) within a zone including the villages Nisi, Psari and Neapoli, where secondary surface ruptures and damages to buildings and infrastructures were observed (Figure 3). Longitude 21° 32’ 19 05” 21° 32’ 15. 34” 21° 33’ 49. 15” 21° 33’ 36. 77” 21° 33’ 40. 81” 21° 34’ 08. 61” 21° 40’ 31. 68” 21° 25’ 19. 61” 21° 24’ 53. 89” 21° 30’ 32. 46” 21° 24’ 04. 19” 21° 24’ 18. 58” 21° 24’ 25. 75” 21° 24’ 25. 84” 21° 29’ 12. 75” 21° 29’ 18. 09” 21° 34’ 29. 25” 21° 34’ 30. 59” 21° 31’ 14. 95” 21° 32’ 41. 45” 21° 30’ 50. 47” 21° 28’ 26. 14” 21° 32’ 17. 74” 21° 08’ 33. 40” 21° 12’ 20. 92”
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