The importance of paleoseismology in seismic hazard studies for critical facilities

Gürpinar, Aybars

doi:10.1016/j.tecto.2005.05.042

Cited by 25 publications

(9 citation statements)

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“…If it was one and the same event that caused both faults (and the Langklip Fault just stopped short of the surface), we cannot make any inference about recurrence intervals of such events in the area. However, if the evidence is interpreted in terms of two separate events, recurrence intervals along the faults may amount to several thousands of years, a commonly accepted figure for recurrence of surfacefaulting events along palaeotectonic zones in some intraplate areas (see Gürpinar, 2005).…”

Section: Discussionmentioning

confidence: 99%

Evidence of Neogene to Quaternary Faulting and Seismogenic Deformation Along the Namaqualand Coast, South Africa

Beer

2012

South African Journal of Geology

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This paper reports on the results of a systematic investigation into evidence of near-surface and surface deformation of Late Cenozoic sediments along the West Coast of South Africa. Regional studies were supplemented by the investigation of pit faces in diamond mines owned by De Beers Consolidated Mines (Pty) Ltd between Hondeklip Bay and Kleinsee and inspection of exploratory trench logs kept by Alexkor at Alexander Bay. The results provide the first substantiation for previous unverified reports of neotectonic faulting in Pliocene to Pleistocene formations along the Namaqualand coast. Associated deformation of unconsolidated marine sediments suggests that the faulting was seismogenic. The interpretations of some of the observed features remain preliminary and the age of the structures is in most cases not well constrained. Some of the faulting at Hondeklip Bay is clearly younger that 3 Ma and the youngest surface rupture observed may be of latest Pleistocene age. This style of reactivation of coast-parallel Mesozoic or older faults is similar to that recently described in Namibia, and known Quaternary reactivation of the Kango fault system in the Southern Cape.

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Section: Discussionmentioning

confidence: 99%

Evidence of Neogene to Quaternary Faulting and Seismogenic Deformation Along the Namaqualand Coast, South Africa

Beer

2012

South African Journal of Geology

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“…The need for fault specific studies and the extraction of recurrence intervals was initiated with the development of paleoseismicity in the 1970s (Sieh, 1978). Since then paleoseismicity has progressed significantly and given the inherent incompleteness of seismic source catalogues, high priority is given to the search and analysis of geologic records of strong earthquake shaking near populated areas and major infrastructure sites (Gurpinar, 2005;Camelbeeck et al, 2007;Rockwell et al, 2010).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Geomorphology of active faulting and seismic hazard assessment: New tools and future challenges

et al. 2015

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“…The long‐term probabilistic seismic hazard can be assessed using a well‐dated and quantitative earthquake history (Gürpinar, ; Mugnier et al ., ). This is particularly relevant in moderately active seismic regions, where the instrumental and historical records are too short to cover the recurrence interval of strong earthquakes (Michetti et al ., ).…”

Section: Introductionmentioning

confidence: 99%

6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia)

et al. 2018

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Sequences of lake sediments often form long and continuous records that may be sensitive recorders of seismic shaking. A multi-proxy analysis of Lake Bohinj sediments associated with a well-constrained chronology was conducted to reconstruct Holocene seismic activity in the Julian Alps (Slovenia). A seismic reflection survey and sedimentological analyses identified 29 homogenite-type deposits related to mass-wasting deposits. The most recent homogenites can be linked to historical regional earthquakes (i.e. 1348 AD, 1511 AD and 1690 AD) with strong epicentral intensity [greater than 'damaging' (VIII) on the Medvedev-Sponheuer-Karnik scale]. The correlation between the historical earthquake data set and the homogenites identified in a core isolated from local stream inputs, allows interpretation of all similar deposits as earthquake related. This work extends the earthquake chronicle of the last 6600 years in this area with a total of 29 events recorded. The early Holocene sedimentary record is disturbed by a seismic event (6617 AE 94 cal yr BP) that reworked previously deposited sediment and led to a thick sediment deposit identified in the seismic survey. The period between 3500 cal yr BP and 2000 cal yr BP is characterized by a major destabilization in the watershed by human activities that led to increases in erosion and sedimentation rates. This change increased the lake's sensitivity to recording an earthquake (earthquake-sensitivity threshold index) with the occurrence of 72 turbidite-type deposits over this period. The high turbidite frequency identified could be the consequence of this change in lake earthquake sensitivity and thus these turbidites could be triggered by earthquake shaking, as other origins are discarded. This study illustrates why it is not acceptable to propose a return period for seismic activity recorded in lake sediment if the sedimentation rate varies significantly. 1777

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The importance of paleoseismology in seismic hazard studies for critical facilities

Cited by 25 publications

References 0 publications

Evidence of Neogene to Quaternary Faulting and Seismogenic Deformation Along the Namaqualand Coast, South Africa

Evidence of Neogene to Quaternary Faulting and Seismogenic Deformation Along the Namaqualand Coast, South Africa

Geomorphology of active faulting and seismic hazard assessment: New tools and future challenges

6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia)

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