Traces d'activité pléistocène de failles dans le Nord du fossé du Rhin supérieur (plaine d'Alsace, France)

Lemeille, Francis; Cushing, Edward Marc; Cotton, Fabrice; Grellet, B.; Ménillet, François; Audru, J.; Renardy, François; Fléhoc, Christine

doi:10.1016/s1251-8050(99)80200-6

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…It is part of the rift that crosses Western Europe, in a roughly north-south direction, from the North Sea to the southern West Mediterranean Sea through the Rhine and Rhone valleys ( Figure 1). A number of critical facilities are located along this rift in different countries, and, consequently, most of the paleoseismic studies of slow faults in Europe are concerned with faults of this tectonic unit (Combes et al, 1993;Camelbeeck and Meghraoui, 1998;Lemeille et al, 1999;Meghraoui et al, 2000;Lehmann et al, 2001;Masana et al, 2001a and2001b;Meghraoui et al, 2001;Vanneste et al, 2001). …”

Section: Structurementioning

confidence: 99%

A Pragmatic Approach to Seismic Parameters in a region with Low Seismicity: The Case of Eastern Iberia

2006

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In intra-plate regions with low-seismic activity, seismic cycles last between 10 3 and 10 5 years and, consequently, quiescent faults may be capable of producing catastrophic earthquakes. Paleoseismic studies, which are necessary to define capable faults in these regions and to establish their seismic parameters, are scarce and not always possible. In order to overcome the scarcity of paleoseismic data, this paper proposes an approach to evaluate the capability and seismic parameters of faults. This approach takes into account instrumental, historical, paleoseismological and geological data. Assuming that in a given structural region with definite climatic and geological characteristics similar geomorphic features reflect a similar structural-seismic evolution, the capability of faults is established by comparing the fault related geomorphic features of the few proven seismogenic faults with those of the rest of the faults. The seismic parameters were estimated using some mathematical relationships from geological and geomorphological data, where the slip rate of the faults was determined from geological and geomorphological criteria. The case of eastern Iberia is presented to illustrate this approach. This area is characterized by low seismicity, few historical destructive earthquakes, and only one fault with good paleoseismological data. Of the 249 potential faults (longer than 10 km and adequately oriented with respect to the current stress field), 23 were regarded as capable faults. Some of these were located in seismic quiescent areas, and their main seismic parameters were estimated.

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Section: Structurementioning

confidence: 99%

A Pragmatic Approach to Seismic Parameters in a region with Low Seismicity: The Case of Eastern Iberia

2006

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“…However, related earthquake events may have been triggered by late‐ and post‐glacial stress changes in the crust still recovering from the effects of ice‐loading. In Central Europe, far from the high‐latitude rebound effects, the potential for success increases, particularly where seismogenic sources can be identified, such as in the Rhine Graben system (Lap 1987; Camelbeeck & Meghraoui 1998; Lemeille et al 1999a). The more active terrains adjacent to the Alps have also yielded promising results (Siegenthaler et al 1987; Beck et al 1996; Chapron et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Palaeoseismicity studies on end-Pleistocene and Holocene lake deposits around Basle, Switzerland

Becker¹,

Davenport²,

Giardini³

2002

Geophysical Journal International

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Summary Palaeoseismological investigations in the lakes of Seewen and Bergsee in the Basle region, Switzerland and southern Germany, revealed characteristic event horizons in an otherwise uniform background sedimentary record. Dated and correlated based on radiocarbon ages, palynostratigraphy and sedimentation rates, some of these event horizons show soft‐sediment deformation features and fractures that can be interpretated as being the result of earthquake shaking. Two of the event horizons with clear indications for earthquake deformation were detected in both lakes, showing approximately the same age as indicated by radiocarbon dating. A third event horizon with fractures of apparent seismogenic origin, was detected at several drill sites in only one lake (Bergsee). Three further event horizons, two in the Bergsee and one in Lake Seewen, are of uncertain origin, though they show some characteristics that could well be caused by earthquakes. Based on the observations in both lakes, five events were detected of which three are most probably related to earthquakes which occurred between 180 BC–1160 BC, 8260 BC–9040 BC and 10 720 BC–11 200 BC, respectively. The Basle region is well known for the strongest historical earthquake north of the Alps, the AD 1356 Basle earthquake. Based on combined historical and palaeoseismological data, it has been inferred that earthquakes with size comparable to the AD 1356 Basle earthquake have occurred several times within the last 12 000 yr and that the recurrence time for such strong earthquakes are in the range of 1500–3000 yr.

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“…Thus, they probably represent the thickest and more mature structures occurring within the reservoir, due to their major role in the Variscan period and their further development by reactivations during the Tertiary episodes reported earlier (Eocene compression, Oligocene extension and subsequent strike‐slip regimes, (Villemin & Bergerat 1987; Schumacher 2002; Édel et al 2007)) and currently activated in a very likely strike‐slip regime. In the URG, the neotectonic activity of faults trending NE–SW, ENE–WSW and NW–SE is incidentally observed (Chorowicz & Deffontaines 1993; Lemeille et al . 1999).…”

Section: Discussionmentioning

confidence: 99%

3-D mapping of permeable structures affecting a deep granite basement using isotropic 3C VSP data

Place¹,

Sausse

Marthelot³

et al. 2011

Geophysical Journal International

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International audienceThis paper illustrates the efficiency of vertical seismic profiling (VSP) for the investigation of dipping and hydraulically conductive structures affecting a granitic basement covered by sediments. A three-component (3C) VSP data set has been acquired in the GPK1 and EPS1 wells of the Soultz-sous-Foreˆts enhanced geothermal system (EGS) located within the Upper Rhine Graben (URG). Our study focuses on the isotropic processing of profiles acquired with vertical vibrator P and their subsequent interpretation. Mainly P-S converted reflections are identified from the analysis of the 3C records. These P-S conversions occur on steep permeable faults that are positioned in space by traveltime modelling. These faults cut the granite basement in several hectometric-scale blocks, and represent the main fluid paths between the boreholes. These faults are thought to be inherited from late Variscan and Alpine deformation periods, reactivated by the current stress field. When properly processed and interpreted, VSP allow the scale gap between surface and borehole data to be bridged

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Traces d'activité pléistocène de failles dans le Nord du fossé du Rhin supérieur (plaine d'Alsace, France)

Cited by 9 publications

References 2 publications

A Pragmatic Approach to Seismic Parameters in a region with Low Seismicity: The Case of Eastern Iberia

A Pragmatic Approach to Seismic Parameters in a region with Low Seismicity: The Case of Eastern Iberia

Palaeoseismicity studies on end-Pleistocene and Holocene lake deposits around Basle, Switzerland

3-D mapping of permeable structures affecting a deep granite basement using isotropic 3C VSP data

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