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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS006 1924 - 1951 Symposium Non-instrumental seismometry - New Approaches to Paleoseismology and Earthquake Recurrence in the 21st Century Convener : Dr. David Schwartz, Dr. Gianluca Valensise Co-Convener : Dr. Daniela Pantosti, Dr. Eullia Masana, Dr. Francisco Gutirrez For the General scopes see introduction to symposium JSS004. Paleoseismology is now a wellestablished discipline whose major goal is the identification and dating of past earthquakes in the geological record. It provides the fundamental data for developing an understanding of the behavior of seismogenic faults in time and space and the primary recurrence information for seismic hazard assessment. Paleoseismlogy has evolved during the past 30 years and is now practiced worldwide. As the field moves into the 21st century there is recognition of the need to: develop longer earthquake chronologies, reduce uncertainties in recurrence times, and develop better knowledge of earthquake recurrence on sources that do not not easily lend themselves to traditional paleoseismic analysis (trenching). We invite contributions on topics that include NEW: -statistical analyses of paleoseimic recurrence data, particularly for correlating the occurrence of past events along faults ; -approaches to identify paleoearthquakes on blind or remote (ie, subduction zone) earthquake sources and in logistically difficult settings such as urban environments; -technologies that increase the length of the paleoseismic record and paleoearthquake chronologies at investigation sites on major faults; -dating techniques of paleoearthquakes; -approaches to quantify slip in paleoearthquakes for better estimates of paleo-earthquake magnitudes

IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS006 Oral Presentation 1924 Paleoliqufaction features as a tool for paleoseismic studies of blind and offshore located faults: preliminary field search in Algeria Dr. Bouhadad Youcef seismic hazard department Earthquake engineering center (Algeria) IASPEI The tellean Atlas chain of Algeria belongs to the African-Eurasian tectonic plates boundary compressive belt where earthquakes are not randomly distributed but may be easily correlated with geological structures. The tectonic style is represented, mainly, by thrust faults which may be blind located offshore and/or onshore. Recent strong earthquakes of El-Asnam, 1980 (Ms=7.3) and Boumerdes, 2003 (Mw=6.8) induced extensive liquefaction features in the epicentral areas. Preliminary field search indicates that paleoliquefaction features may be found in theses areas. Therefore, it may constitutes a precious geological tool for paleoseismic studies knowing that either in the case of blind faults or offshore located faults trace of faulting is inaccessible. Keywords: paleoliquefaction blind fault

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