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Geophysical investigation of a recent shallow fault

Université Louis Pasteur (Strasbourg I), France

EPGS class 2001–2002^*

^*EPGS 2001–2002 class—Supervisory staff: M. Amalvict, H. Blumentritt, D. Boulanger, M. Frogneux, J. F. Girard, F. Ledrappier, B. Luck, M. Munschy, P. Sailhac, and J.J. Schott; EPGS students: H. Bideaud, A. Bonnel, F. Brenguier, J. Charletty, E. Couprie, S. Drouet, D. Eckert, N. Gabriel, M. Lange, C. Le Delliou, D. Lombardi, O. Meric, S. Michelet, G. Peron Pinvidic, T. Tisserant, and A. Tocheport; DEA students: D. Bouzhekar, H. Brenot, P. Edme, G. Pelfrene, A. Roussel, and H. Vazquez.

Corresponding author: maksim.bano@eost.u-strasbg.fr

The first 20% of the full text of this article appears below.

Since 1994 the students of the third year of the Ecole de Physique du Globe de Strasbourg (EPGS) start their last school year (roughly in mid-September) by performing a geophysics field camp. Students (including teachers) participate in hands-on geophysical studies using the methods of seismic reflection and refraction, gravity, magnetics, electrical resistivity, electromagnetics, and ground penetrating radar (GPR). They collect data with modern equipment; they process, model, and interpret the data with workstation and PCs; and they present their results in both oral and written form.

After the field camp, students have one week to finish a preliminary report where they describe the methods used and show the raw data. Subsequently, they integrate their results with others in their teams in order to prepare a final written report. The oral reports (in mid-January) are the culmination of a great effort, and the students are very proud of these presentations. The main research goals have been focused on topics related to problems of the shallow subsurface. An exhaustive Web site (http://arnica.u-strasbg.fr/) showing the curriculum of EPGS is conceived and is maintained by EPGS's Jean-Michel Marthelot.

In this paper we present a tectonic study of the field portion that took place within one week on September 2001. The surveyed area is located in the central part of the upper Rhinegraben, a few kilometers south of Wissembourg, close to the western border. A normal fault has been evidenced in the open sand quarry of Riedseltz (Figure 1). It was an opportunity for (1) practicing geophysical prospecting, as part of the final year curriculum of EPGS, (2) testing various methods for imaging a shallow fault, (3) locating and following the fault outside of the quarry. The study was partly supported by the BRGM (Bureau de Recherches Géologiques et Minières).

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