Les formations néogènes lacustres de l'Attique du Nord -Béotie : stratigraphie, palynologie et tectonique

Μέττος, Α.; Ioakim, Chryssanthi; Rondoyanni, Th.

doi:10.3406/geolm.1985.1347

Cited by 2 publications

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“…Neotectonic fault scarps clearly indicate normal faulting with fault planes dipping to the north (e.g. Mettos et al, 1986Mettos et al, , 1992. Three strong earthquake sequences occurred ID: Code number, YY: year, MM: month, DD: day, hh: hour, mm: min., ss: sec., Acc: accuracy of time, Lat: geographic latitude, Long: geographic longitude, I: maximum intensity, M: Richter magnitude equivalent to surface-wave magnitude, h: focal depth in km, n: shallow shock, Rel: reliability of the event, Ref1: previous publication considered, Ref2: further reading, (+) means equal to or larger than, (−) means equal to or less than, Acc and Rel are explained in the text.…”

Section: The Athens M59 Earthquake Of 7 September 1999 31 Backgrounmentioning

confidence: 99%

The problem of seismic potential assessment: Case study of the unexpected earthquake of 7 September 1999 in Athens, Greece

2014

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Lessons learned form the disastrous earthquake (M W = 5.9) that hit the metropolitan area of Athens, Greece, on 7 September 1999, are examined particularly as for the seismic potential considered before the earthquake occurrence. A general belief was created in the past decades that the seismic potential in Athens was very low. Fault plane solutions of the 1999 shock indicate that it was associated with a normal fault trending WNW-ESE and dipping to SW. Field geological observations conducted after the event in the Fili neotectonic fault, situated at 15-20 km to the north of Athens, imply that it has possibly been the seismogenic structure of the main rupture, and that it reactivated in very recent geological times. Archaeoseismological observations performed in the ancient Fili Fort, revealed repaired structural damage that was very likely caused by an earthquake occurring in palaeochristianic or Byzantine times. From a new catalogue of historical earthquakes it results that the main events of 1705, 1805 and 1889 could be tentatively located within a distance of ∼30 km from Athens although the little macroseismic information available makes their locations quite uncertain. During the instrumental period of observation, only few small shocks were recorded in the Athens region. It is obvious that should a research effort had been undertaken before the 1999 earthquake, certainly it would be concluded that at least one strong earthquake took place in historical times in the broad region affected in 1999, and that the Fili fault is active and is capable to produce strong shocks in the future. However, such a study was never conducted by the scientific community beforehand.

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Section: The Athens M59 Earthquake Of 7 September 1999 31 Backgrounmentioning

confidence: 99%

The problem of seismic potential assessment: Case study of the unexpected earthquake of 7 September 1999 in Athens, Greece

2014

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Active normal faulting in central Greece: an overview

Roberts¹,

Jackson²

1991

192

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Rapid extension in central Greece is accommodated by large active normal faults that largely control the geomorphology. The faults bound graben whose asymmetry is evident in the topography, bathymetry, vertical movements of the coastline and tilting of Neogene sediments adjacent to them. Graben up to 20 km in width appear to be simple half-graben, whereas the hangingwalls in wider graben are generally broken by faults antithetic to the major bounding faults. The graben form basins up to 100 km long, but the faults bounding these basins are segmented, with individual segments no longer than about 20 km. The fault segments step en echelon or change polarity along strike of the large basins, but are not linked by simple strike-slip (‘transfer’) faults: the regions between the main fault segments appear to be pervasively deformed by numerous small faults. Drainage in central Greece is controlled by fault segmentation and footwall lithology. Where footwalls consist of Mesozoic limestone the drainage is often axial, breaking through the fault system into the main basin by flowing round the ends of fault segments or through gaps where the fault segments step. In such places, drainage directly off the fault scarps is relatively minor, and the fault segmentation controls the spacing of major fans along the basin margin. Where footwalls consist of Neogene sediments, drainage may flow directly across the fault scarp, though in such cases the catchment areas are relatively small and linear. The origin of the fault segmentation is unclear, but may be related to rotations of the fault-bounded blocks about horizontal and vertical axes.

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Les formations néogènes lacustres de l'Attique du Nord -Béotie : stratigraphie, palynologie et tectonique

Cited by 2 publications

References 0 publications

The problem of seismic potential assessment: Case study of the unexpected earthquake of 7 September 1999 in Athens, Greece

The problem of seismic potential assessment: Case study of the unexpected earthquake of 7 September 1999 in Athens, Greece

Active normal faulting in central Greece: an overview

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