| 4A (2025-2026) | ASSESSMENT OF THE GEOTHERMAL POTENTIAL OF THE ALTO GUADIANA TERRITORY ON THE BASIS OF TECTONIC AND HYDROGEOLOGICAL OBSERVATIONS |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4B (2008-2009) | TASK FORCE KIRGISTAN |  |  | — | 
                    
                
                    
                    
                        
                            | 4B (2010-2015) | Raft River EGS |  |  | — | 
                    
                
                    
                    
                        
                            | 4B (2016-2018) | ANR-Remake Quito basin |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4B (2019-2020) | iTarg3T |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4B (2021-2021) | El Paso Iglesias |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4B (2022-2022) | Seismometer to Investigate Ice and Ocean Structure (SIIOS) Field Experiment: Hiawatha Crater, Greenland |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4B (2023-2026) | Seismic Network Around Kangaroo Eyre Yorke |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4C (2005-2010) | Semipalatinsk Test Site Network |  | Kazakhstan | — | 
                    
                
                    
                    
                        
                            | 4C (2011-2014) | NERA-JRA1-A |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4C (2015-2015) | GeoGirls outreach experiment at Mount St. Helens |  |  | — | 
                    
                
                    
                    
                        
                            | 4C (2016-2016) | Summer of Applied Geophysical Experience Active Seismic  2016 |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4C (2017-2019) | TIPTIMON AFGHANISTAN 2 |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4C (2020-2024) | Inter-Wind |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4C (2025-2027) | TEC-HERITAGE |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4D (1985-2009) | Seismological Experiments on Swiss Glaciers |  | Switzerland | DOI | 
                    
                
                    
                    
                        
                            | 4D (2010-2011) | Parkfield Experiment to Record Microseismicity and Tremor |  |  | — | 
                    
                
                    
                    
                        
                            | 4D (2012-2025) | Swiss temporary deployments on glaciers |  | Switzerland | DOI | 
                    
                
                    
                    
                        
                            | 4E (2010-2011) | MARS/Testing of cabled broadband OBS using MARS test facility |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4E (2012-2013) | G9 |  | — | — | 
                    
                
                    
                    
                        
                            | 4E (2015-2016) | Field Research Station broadband seismometer network |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4E (2018-2018) | Raton 3C Nodes 2018 |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4E (2019-2019) | Valles 3C Node Transect |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4E (2020-2021) | Nodal seismic experiment at the Berkeley section of the Hayward fault |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4E (2022-2023) | Antarctica Ice Rift Experiment |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4E (2024-2024) | VECTOR seismic array in the Lausitz, Germany |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4E (2025-2025) | Prototyping Alaska Coastal Arrays |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4F (2007-2011) | Askja 2007 |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4F (2013-2014) | Temp-CNCH |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4F (2015-2025) | North Texas Earthquake Study: Venus (Johnson County), TX |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4G (2007-2030) | EMSO-Azores |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4H (2009-2010) | EAL1 |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4H (2011-2012) | Nabro Urgency Array |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4H (2014-2017) | Oklahoma State University Seismic Network |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4H (2018-2021) | Mulhouse Seismo Citizen |  |  | — | 
                    
                
                    
                    
                        
                            | 4H (2022-2022) | Embayment Seismic Excitation Experiment 2022 |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4H (2023-2023) | USGS Bald Eagle Sackung |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4H (2024-2025) | Rapid nodal deployment after the April 5, 2024 New Jersey earthquake |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4I (2010-2018) | Brady Hot Spring EGS |  | United States of America | — | 
                    
                
                    
                    
                        
                            | 4I (2020-2050) | RASPY |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4J (2014-2016) | AQ3 SW Queensland and NW New South Wales |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4J (2017-2024) | Red sísmica Bioko |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4K (2014-2016) | UAE transects across the Semail Ophiolite |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4K (2017-2022) | Ruegen Cliff Observatory |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4K (2023-2023) | Mount Rainier 2023 |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4K (2024-2025) | Fiordland Seismological Sounding of Landslides and Earthquakes (FISSLE) |  | — | DOI | 
                    
                
                    
                    
                        
                            | 4L (2014-2016) | IMAGE Reykjanes |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4L (2017-2019) | Canoe Reach Geothermal Field |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4L (2020-2022) | Bedload Monitoring of Ephemeral Streams 2022 Nodal Portion |  |  | DOI | 
                    
                
                    
                    
                        
                            | 4L (2023-2025) | Tenerife-Gran Canaria Seismic Network (GUANCHE_INTEGRAL) |  | — | DOI |