In 1996, three new accelerometers (4-component sensors) built by the CSMA and one hydrophone were deployed. As in past years, the 4-component sondes were located in boreholes 4616 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-4616), 4601 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-4601) and 4550 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-4550) within the granite and the hydrophone was deployed in EPS1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-EPS1). Unlike the previous episodes, the accelerometers were not grouted in the boreholes. The X,Y,Z coordinates in the file refer to the local coordinate system with the GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1) wellhead as origin: X: Easting in meters from GPK1 wellhead (toward UTM32 East) Y: Northing in meters from GPK1 wellhead (toward UTM32 North) Z: Depth in meters from GPK1 wellhead The local coordinate system is based on the UTM32 system. The coordinates of the stations in the local coordinate system have been obtained from the CSMA report for Socomine by Jones and Jupe, 1997 (Microseismic results from the Soultz 1996 experimental programme). The latitude, longitude and elevation in the WGS84 coordinate system have been derived from the local coordinate system. Last update of data: 16/02/2021

A series of hydraulic tests were performed from August to October 1996 at the GPK2 well (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK2). First a production test was conducted in August to determine the productivity of the well. The production test was followed by a second stimulation of GPK2 after the previous one in 1995. The open hole section of the well was re-stimulated at flowrates up to 78 l/s. A total of 28000 m3 of fluid was injected during the test. The stimulation was followed by a stepped injection test to determine the injectivity of the well after the stimulation. Finally, two circulation tests during which the water produced from GPK2 was reinjected in GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1) were performed in October 1996. About 7500 microseismic events were detected during the experiments, and about 5700 were located. Dates of the different tests of the 1996 hydraulic programme: - Production test at GPK2: from 09:20 14/08/96 to 03:40 15/08/96 - Stimulation test at GPK2: from 16:30 18/09/96 to 22:15 25/09/96 - Stepped injection test at GPK2: from 10:30 29/09/96 to 04:00 06/10/96 - First circulation test between GPK2 and GPK1: from 10:04 12/10/96 to 12:09 20/10/96 - Second circulation test between GPK2 and GPK1: from 15:30 28/10/96 to 19:10 30/10/96 The Episode contains the following datasets: - Microseismic downhole network - Soultz-sous-Forêts 1996 Stimulation and Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1996-Downhole_network); - Microseismic catalogue with moment magnitude of the downhole network from CSMA - Soultz-sous-Forêts 1996 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1996-Catalogue) - Microseismic catalogue with seismic moment and moment magnitude from Drif et al.(2024) - Soultz-sous-Forêts 1996 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1996-Catalogue_Drif); - Catalogue with hydraulic data from Drif et al.(2024)- Soultz-sous-Forêts 1996 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1996-Seismic_Hydraulic_Comparaison_Drif); - Flow logs - Soultz-sous-Forêts 1996 Stimulation and Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1996-Flow_logs); - Temperature logs - Soultz-sous-Forêts 1996 Stimulation and Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1996-Temperature_logs); - Hydraulic data - Soultz-sous-Forêts 1996 Stimulation and Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1996-Hydraulic);

The downhole seismic network in 2000 consisted of three accelerometers (4-component sensors) built by the CSMA and two hydrophones. The two first accelerometers were placed in boreholes 4550 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-4550) and 4601 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-4601) and were assumed to have the same locations as in 1996. The last one was placed in OPS4 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-OPS4), an additional observation well drilled in early 2000 to improve the efficiency of the network. The three accelerometers were deployed at around 1500 m depth. The hydrophones were deployed much deeper at around 2000 m depth in borehole EPS1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-EPS1) and at 3500 m depth in borehole GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1). The detection of seismic events was performed by trigerring. Each recorded signal has a duration of 2 s. The X,Y,Z coordinates in the file refer to the local coordinate system with the GPK1 wellhead as origin: X: Easting in meters from GPK1 wellhead (toward UTM32 East) Y: Northing in meters from GPK1 wellhead (toward UTM32 North) Z: Depth in meters from GPK1 wellhead The local coordinate system is based on the UTM32 system. The coordinates of the stations in the local coordinate system have been obtained from the Semore Seismic report for Socomine by B. Dyer, 2001 (Soultz GPK2 stimulation June/July 2000. Seismic monitoring report). The latitude, longitude and elevation in the WGS84 coordinate system have been derived from the local coordinate system. Last update of data: 11/06/2021

Microseismic catalogue of the 2005 episode at Soultz-sous-Forêts calculated by B.C. Dyer using the downhole network. Number of events: 3709. The catalogue covers the four phases of the 2005 hydraulic program at GPK4. The events were located by a combination of automatic and manual processing methods. Only events that could be located with an RMS misfit inferior to 5 ms were accepted in the catalogue. Time period: 04/02/2005 01:41:37 - 01/04/2005 18:33:43 (UTC time). The data parameters are the following: Column 1: Event ID Column 2: Experiment phase of the hydraulic program Column 3: Date (UTC) Column 4: Time (UTC) Column 5: Easting from GPK1 wellhead * Column 6: Northing from GPK1 wellhead * Column 7: Depth from GPK1 wellhead * Column 8: Latitude WGS84 ** Column 9: Longitude WGS84 ** Column 10: Elevation WGS84 ** Column 11: RMS Column 12: Local magnitude *** * The local coordinate system is based on the UTM32 system. ** Latitude, longitude and elevation have been derived from easting, northing and depth from GPK1 wellhead. *** The magnitude has been estimated using the relationship derived by Sophie Michelet/Matthieu Darnet based on the peak amplitude at the 4550V sensor: M = (-11 + log10 ((0.85 * PeakAmplitudeAt4550V) / 1.0e-9)) * 1.85. Last update of data: 03/03/2022

Hydraulic data recorded at GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1) and EPS1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-EPS1) during the 1994 hydraulic programme. 5 datasets are available: -SSFC1994-Hydraulic_production.csv : Hydraulic data from GPK1 and EPS1 recorded from 14:56:19 16/06/94 to 10:15:44 28/06/94 during the production test at GPK1. -SSFC1994-Hydraulic_production_GPK1.csv : Downhole hydraulic data from GPK1 recorded from 19:42:40 15/06/94 to 07:39:56 30/06/94 during the production test at GPK1. -SSFC1994-Hydraulic_production_EPS1.csv : Hydraulic data from EPS1 recorded from 08:36:33 16/06/94 to 09:15:40 30/06/94 during the production test at GPK1. -SSFC1994-Hydraulic_injection.csv : Hydraulic data from GPK1 recorded from 11:06:29 05/07/94 to 05:35:02 17/07/94 during the injection test at GPK1. -SSFC1994-Hydraulic_injection_GPK1.csv : Downhole hydraulic data from GPK1 recorded from 10:58:39 05/07/94 to 12:56:06 16/07/94 during the injection test at GPK1. For an unknown reason some data are missing on several time periods for the files SSFC1994-Hydraulic_production_GPK1.csv, SSFC1994-Hydraulic_production_EPS1.csv and SSFC1994-Hydraulic_injection_GPK1.csv. Last update of data: 24/01/2020

Hydraulic data recorded at GPK1, GPK2, GPK3, GPK4 and EPS1 during the 2004 hydraulic program. Two datasets are available: SSFS2004-Hydraulic_injection.csv: hydraulic data from 07/09/2004 to 12/09/2004 during the low flow injection test at GPK4 SSFS2004-Hydraulic_stimulation.csv: hydraulic data from 12/09/2004 to 02/10/2004 during the stimulation test at GPK4 The data parameters for the file SSFS2004-Hydraulic_injection.csv are the following: Column 1: Date and time (UTC) Column 2: Qin_MeSy - GPK4 injection flowrate Column 3: Vin - Cumulative volume of injected fluid Column 4: Tin_MeSy - Temperature of injected fluid Column 5: WL_Tank - Water level in the tank * Column 6: P_Tank - Pressure in the tank * Column 7: Rho_Tank - Density of injected fluid Column 8: Pw3 - GPK3 wellhead pressure Column 9: Pan3 - GPK3 annulus pressure Column 10: Pw2 - GPK2 wellhead pressure Column 11: Pan2 - GPK2 annulus pressure Column 12: Pw4 - GPK4 wellhead pressure Column 13: Pan4 - GPK4 annulus pressure Column 14: Pan_EPS1 - EPS1 annulus pressure The data parameters for the file SSFS2004-Hydraulic_stimulation.csv are the following: Column 1: Date and time (UTC) Column 2: Qin_omega - GPK4 injection flowrate Column 3: Vin - Cumulative volume of injected fluid Column 4: Qout - GPK3 production flowrate Column 5: Vout - Cumulative volume of produced fluid Column 6: Tin_omega - Temperature of injected fluid Column 7: Tout2 - Temperature of produced fluid Column 8: Tout3 - Temperature of produced fluid (other sensor) Column 9: WL_Tank - Water level in the tank * Column 10: P_Tank - Pressure in the tank * Column 11: Rho_Tank - Density of injected fluid Column 12: Pw3 - GPK3 wellhead pressure Column 13: Pan3 - GPK3 annulus pressure Column 14: Pw2 - GPK2 wellhead pressure Column 15: Pan2 - GPK2 annulus pressure Column 16: Pw4 - GPK4 wellhead pressure Column 17: Pan4 - GPK4 annulus pressure Column 18: Pan_EPS1 - EPS1 annulus pressure Column 19: Pwc1 - GPK1 wellhead pressure Column 20 : Pan1 - GPK1 annulus pressure * The tank was used as a buffer for injection fluid. Last update of data: 31/10/2018

During February/March 2005 a hydraulic stimulation program was conducted in the well GPK4 (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSF-GPK4) at European Hot Dry Rock Project, Soultz-sous-Forêts, France. It is the second stimulation of GPK4, after the previous one, performed in September 2004. The hydraulic stimulation was followed a few days later by a program of chemical stimulation (injection of diluted HCl). This program involved the chemical stimulation itself and two identical step-rate injection tests. The first injection test was performed before the chemical stimulation and the second after, in order to observe the efficiency of the chemical stimulation. Dates of the 2005 hydraulic programme: - Second hydraulic stimulation of GPK4: from 18:05 07/02/2005 to 18:00 11/02/2005. - First step-rate injection test of GPK4: from 15:30 22/02/2005 to 15:30 25/02/2005. - Chemical stimulation of GPK4 with HCl: from 13:30 02/03/2005 to 06:00 05/03/2005. - Second step-rate injection test of GPK4: from 10:00 13/03/2005 to 09:55 16/03/2005. The Episode contains several datasets which you can find further down the page in "Links".

Seismological signals acquired at Soultz-sous-Forêts during the 2004 Stimulation episode. The waveforms were recorded by a downhole and a surface seismological network during the hydraulic stimulation of well GPK4 (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSF-GPK4). The complete description of the downhole seismological network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2004-Downhole_network). Last update of data: 31/01/2020

Microseismic catalogue of the 2003 episode at Soultz-sous-Forêts calculated by B.C. Dyer, R. Baria and S. Michelet using the downhole network. Number of events: 21979. The catalogue covers the five phases of the 2003 hydraulic program. Seismic monitoring continued several days after the circulation test. Events were located by a combination of automatic and manual processing methods. Only events that could be located with an RMS misfit < 15 ms were accepted in the catalogue. Time period: 27/05/2003 16:10:29 - 28/07/2003 04:06:26 (UTC time). The data parameters are the following: Column 1: Event ID Column 2: Experiment phase of the hydraulic program Column 3: Date (UTC) Column 4: Time (UTC) Column 5: Easting from GPK1 wellhead * Column 6: Northing from GPK1 wellhead * Column 7: Depth from GPK1 wellhead * Column 8: Latitude WGS84 ** Column 9: Longitude WGS84 ** Column 10: Elevation WGS84 ** * The local coordinate system is based on the UTM32 system. ** Latitude, longitude and elevation have been derived from easting, northing and depth from GPK1 wellhead. The description of the downhole network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2003-downhole_network). Last update of data: 31/08/2021

In June and July 1994, the hydraulic experimental programme consisted of a production test and an injection test at GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1). During the production test in June, EPS1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-EPS1) was used as injection well. A total of 6200 m3 of fluid were produced during the test. Then the injection test in July was intended to determine the injectivity of the stimulated fracture system as a function of the flowrate. A total of 9600 m3 of water were injected at various flowrates during the test (Baria, R., 1996.The European HDR programme 1992 - 1995). Dates of the different tests of the 1994 hydraulic programme: - Production test at GPK1: from 15:58 16/06/94 to 10:15 28/06/96 - Injection test at GPK1: from 11:06 05/07/94 to 14:56 13/07/96 The Episode contains the following datasets: - Microseismic downhole network - Soultz-sous-Forêts 1994 Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFC1994-Downhole_network); - Microseismic catalogue of the downhole network from CSMA - Soultz-sous-Forêts 1994 Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFC1994-Catalogue_all); - Microseismic catalogue with moment magnitude of the downhole network from CSMA - Soultz-sous-Forêts 1994 Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFC1994-Catalogue); - Flow logs - Soultz-sous-Forêts 1994 Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFC1994-Flow_logs_gpk1); - Temperature logs - Soultz-sous-Forêts 1994 Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFC1994-Temperature_logs_gpk1); - Hydraulic data - Soultz-sous-Forêts 1994 Hydraulic Tests (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFC1994-Hydraulic);