eprintid: 1386 rev_number: 23 eprint_status: archive userid: 2 dir: disk0/00/00/13/86 datestamp: 2015-02-25 08:02:30 lastmod: 2017-02-08 12:21:32 status_changed: 2015-04-27 12:10:48 type: article metadata_visibility: show creators_name: Bommer, Julian J. creators_name: Oates, Stephen creators_name: Cepeda, José Mauricio creators_name: Lindholm, Conrad creators_name: Bird, Juliet creators_name: Torres, Rodolfo creators_name: Marroquín, Griselda creators_name: Rivas, José creators_id: j.bommer@imperial.ac.uk creators_id: creators_id: creators_id: creators_id: creators_id: creators_id: creators_id: corp_creators: Civil and Environmental Engineering, Imperial College London, South Kensington campus, London SW7 2AZ, UK corp_creators: Shell International Exploration and Production, Kesslerpark 1, 2288-GS, Rijswijk-ZH, The Netherlands corp_creators: Universidad Centroamericana "Jose Simeon Canas", Bulevar de los Proceres, San Salvador, El Salvador corp_creators: NORSAR/ICG, P.O. Box 53, N-2027 Kjeller, Norway corp_creators: LaGeo, Km 11 1/2 Carretera al Puerto de la Libertad desvı´o a Santa Tecla, El Salvador corp_creators: Servicio Nacional de Estudios Territoriales (SNET), Km 5 1/2 Carretera a Santa Tecla, Avenida Las Mercedes, Edificio ISTA, San Salvador, El Salvador title: Control of hazard due to seismicity induced by a hot fractured rock geothermal project ispublished: pub subjects: RSS1 subjects: SG subjects: SS divisions: EPOS-P full_text_status: none keywords: Induced seismicity; Seismic hazard; Geothermal energy; Hot fractured rock; Vibration thresholds abstract: In 2003 hydraulic stimulations were carried out in a geothermal field in eastern El Salvador, Central America, as part of a project to explore the feasibility of commercial hot fractured rock energy generation. A key requisite for this environmentally friendly energy source is that the fracturing of the hot rocks at depths of 1–2 km must not produce levels of ground shaking at the surface that would present a serious disturbance or threat to the local population. Thresholds of tolerable ground motion were inferred from guidelines and regulations on tolerable levels of vibration and from correlations between instrumental strong-motion parameters and intensity, considering the vulnerability of the exposed housing stock. The thresholds were defined in terms of peak ground velocity (PGV) and incorporated into a “traffic light” system that also took account of the frequency of occurrence of the induced earthquakes. The system was implemented through a dedicated seismograph array and locally derived predictive equations for PGV. The “traffic light” was used as a decision-making tool regarding the duration and intensity of pumping levels during the hydraulic stimulations. The system was supplemented by a small number of accelerographs and re-calibrated using records obtained during the rock fracturing. date: 2006-03-03 date_type: published publication: Engineering Geology volume: 83 number: 4 publisher: Elsevier pagerange: 287-306 id_number: doi:10.1016/j.enggeo.2005.11.002 refereed: TRUE issn: 00137952 official_url: http://dx.doi.org/10.1016/j.enggeo.2005.11.002 access_IS-EPOS: limited owner: Publisher citation: Bommer, Julian J. and Oates, Stephen and Cepeda, José Mauricio and Lindholm, Conrad and Bird, Juliet and Torres, Rodolfo and Marroquín, Griselda and Rivas, José (2006) Control of hazard due to seismicity induced by a hot fractured rock geothermal project. Engineering Geology, 83 (4). pp. 287-306. DOI: https://doi.org/10.1016/j.enggeo.2005.11.002