Episode: 1991 Stimulation Soultz-sous-Forêts

Collection

During the 1991 episode, two 50‑hour injection tests were performed in GPK‑1 at 7 and 15 L/s, generating significant induced seismicity. A network of CSM accelerometer probes and hydrophones in nearby wells detected over 400 events, about 60% of which were successfully located.

Soultz-sous-Forêts

1991

Hydraulic Stimulation

Last updated on July 30, 2026

Episode: 1988 Stimulation Soultz-sous-Forêts

Collection

The Soultz‑sous‑Forêts HDR site was selected in 1986, leading to the drilling of the 2000 m‑deep GPK‑1 well. A 1988 low‑rate injection test triggered microseismicity, with events migrating deeper than the injection zone.

Soultz-sous-Forêts

1987 - 1988

Injection test

Last updated on July 30, 2026

Episode: 2020 Stimulation Geoven geothermal project at Vendenheim

Collection

Vendenheim

Jan. 24, 2020 - Oct. 18, 2020

Injection test / Production test

Last updated on July 29, 2026

Episode: 2019 Stimulation Geoven geothermal project at Vendenheim

Collection

Vendenheim

Feb. 28, 2019 - Dec. 31, 2019

Injection test / Production test

Last updated on July 28, 2026

Episode: 2003 Stimulation Soultz-sous-Forêts

Collection

The May–July 2003 hydraulic programme at GPK‑3 involved an 11‑day deep stimulation injecting 34 000 m³ of water (including an initial 450 m³ brine slug), followed by a 17‑day post‑stimulation circulation test between GPK‑3 and GPK‑2. Microseismic monitoring continued throughout the operations until late August, capturing the system’s response across five distinct hydraulic phases.

Soultz-sous-Forêts

May 27, 2003 - July 28, 2003

Hydraulic Stimulation / Circulation Test

Last updated on July 27, 2026

Episode: 2004 Stimulation Soultz-sous-Forêts

Collection

The 2004 programme consisted of a low‑flow injectivity test followed by the first stimulation of GPK‑4, during which 9 300 m³ of water were injected at 30–45 L/s.

Soultz-sous-Forêts

Sept. 8, 2004 - Sept. 16, 2004

Hydraulic Stimulation

Last updated on July 27, 2026

Episode: 2005 Stimulation Soultz-sous-Forêts

Collection

The 2005 program included a second hydraulic stimulation of the GPK-4 well, followed a few days later by a chemical stimulation using diluted hydrochloric acid. Two injection tests with increasing flow rates, one before and one after the acid treatment.

Soultz-sous-Forêts

Feb. 7, 2005 - March 16, 2005

Hydraulic Stimulation

Last updated on July 27, 2026

Episode: 2000 Stimulation Soultz-sous-Forêts

Collection

The June–July 2000 hydraulic programme at GPK‑2 involved a six‑day deep stimulation over the 4431–5084 m openhole interval, injecting 27 800 m³ of water including an initial 700 m³ brine slug to promote downward fracture growth. After a one‑week pause, a post‑stimulation injection test was performed, followed by 11 days of continued seismic monitoring.

Soultz-sous-Forêts

June 30, 2000 - July 15, 2000

Hydraulic Stimulation

Last updated on July 27, 2026

Episode: 1996 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Collection

The 1996 hydraulic programme at GPK‑2 included a production test, a major re‑stimulation injecting 28 000 m³ at rates up to 78 L/s, a stepped injectivity test, and two short circulation experiments between GPK‑2 and GPK‑1. Around 7 500 microseismic events were detected, with about 5 700 successfully located.

Soultz-sous-Forêts

Aug. 14, 1996 - Oct. 30, 1996

Production test / Hydraulic Stimulation / Stepped Injection Test

Last updated on July 27, 2026

Episode: 1995 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Collection

The 1995 hydraulic program tested GPK‑2 and its ability to circulate with GPK‑1. After low injectivity was confirmed, short‑ and long‑term stimulations were performed, followed by post‑fracturing tests and three brief circulation experiments between the two wells.

Soultz-sous-Forêts

June 11, 1995 - Aug. 20, 1995

Injection test / Hydraulic Stimulation / Circulation Test

Last updated on July 23, 2026

Episode: 1993 Stimulation Soultz-sous-Forêts

Collection

During the 1993 program, GPK‑1 was deepened to 3590 m and subjected to large‑scale hydraulic stimulations to investigate major natural fractures. Across two main tests injecting a total of 44 000 m³ of water, about 18 700 microseismic events were detected, with activity monitored by both downhole and surface networks.

Soultz-sous-Forêts

Sept. 2, 1993 - Oct. 26, 1993

Hydraulic Stimulation

Last updated on July 23, 2026

Episode: Geoven geothermal project at Vendenheim

Collection

The Geoven project in Vendenheim aimed to produce geothermal power from two deep wells, but repeated induced seismicity during drilling and testing led authorities to permanently shut it down in December 2020, with another ML 3.9 event occurring in June 2021.

Vendenheim

March 14, 2018 - Oct. 18, 2020

Injection test / Production test

Last updated on July 10, 2026

Data related to the article Mattern et al., 2026, Seasonal Subsurface Seismic Velocity Changes in the Upper Rhine Graben: Insights from Ambient Noise Interferometry

Dataset

dv/v estimates from ambient noise interferometry from 141 seismic stations in the Upper Rhine Graben (2019–2023), with one file per station pair.

Upper Rhine Graben

Jan. 1, 2019 - Jan. 1, 2023

Seismology

Last updated on July 9, 2026

Velocity model and static corrections used by N. Cuenot to locate seismic events acquired from the downhole and surface network - Soultz-sous-Forêts 2000 Stimulation

Dataset in collection Episode: 2000 Stimulation Soultz-sous-Forêts

Velocity models from Cuenot’s thesis were built from GPK1 sonic logs and calibration shots, first as an initial model for preliminary locations, then refined into the final model.

Soultz-sous-Forêts

2000

Model

Last updated on July 1, 2026

Seismological waveforms - Soultz-sous-Forêts 2004 Stimulation

Dataset in collection Episode: 2004 Stimulation Soultz-sous-Forêts

Seismological signals recorded at Soultz‑sous‑Forêts during the 2004 stimulation of well GPK4 capture both downhole and surface waveforms, documented through dedicated network descriptions available in the associated metadata.

Soultz-sous-Forêts

2004

Seismology

Last updated on June 30, 2026