Ó Birkha¨user Verlag, Basel, 2006

Pure appl. geophys. 163 (2006) 2049–2050 0033–4553/06/102049–2 DOI 10.1007/s00024-006-0114-2

Pure and Applied Geophysics

Rock Damage and Fluid Transport, Part II ARNO ZANG, Ove STEPHANSSON, and GEORG DRESEN

Introduction This volume forms the second part of a topical issue generated from contributions presented at the Euroconference on Rock Physics and Geomechanics that was held at the GeoForschungsZentrum Potsdam, Germany in September 2004. Part I of this volume (Pure and Applied Geophysics, Volume 163, No. 5) mainly contains papers related to problems of rock damage, fracture mechanics, and stresses in rock. Part II contains contributions on transport properties of fractured rocks which were studied with advanced techniques at the laboratory scale and the field scale. Elsworth and Yasuhara conduct circulation experiments on fractures in novaculite and limestone, intermittently imaged by X-ray computer tomography. Xiao et al. measure permeability, storage capacity, volumetric strain and creep during the deformation of hot-pressed calcite samples with different volume fractions of quartz. Song and Renner investigate the influence of heterogeneities on hydraulic properties of Fontainebleau sandstone applying harmonic pore pressure testing. On a larger scale, Albrecht and Mansurov estimate porosity and permeability analysing the velocity dispersion of elastic waves near boreholes. Huenges et al. monitor fluid pressure variations in a borehole sunk in geothermal reservoir rocks of the Rotliegend formation in NE-Germany. Three manuscripts from part II focus on rock damage. At the laboratory scale Ganne and Vervoort study the difference in crack damage induced by either compressive or tensional stresses in limestones. Hall et al. monitor fracture propagation in Neapolitan tuff using acoustic emission and crack imaging techniques to understand collapse phenomena of underground cavities below the city of Naples. Vinciguerra et al. report laboratory P- and S-wave velocity measurements on tuff aiming to unravel the seismic velocity structure of the Campi Flegrei Caldera in Italy.

GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany.

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A. Zang et al.

Pure appl. geophys.,

Heffer and King address the question of a metastable or critical crust and the evolution of effective moduli towards the critical point of fracturing. German uses a statistical model describing energy scaling of inter-event times (seismic waiting time distributions). Finally, we would like to express our sincere thanks to the reviewers that contributed their time and efforts to the success of Part II of this volume: M. Albrecht, M. Bohnhoff, E. Brueckl, M. Di Marzio, D. Elsworth, S. Fomin, J. Fortin, J. Fredrich, A. Gray, V. German, B. Haimson, S. Hainzl, A. Kaselow, P. Knoll, I. Main, H. Milsch, J. Napier, A. V. Nikolaev, J. Renner, F. Roth, K. Sato, A. Schubnel, S. Stanchits, J. ter Heege, B. Thompson, C-F. Tsang, D. Turcotte and R. Zimmermann.