{ "project": { "name": "Utah Forge Project", "created_timestamp": "Wed, Feb 25 2026 14:46:13 UTC", "last_modified_timestamp": "Thu, Mar 19 2026 18:21:31 UTC", "notes": "We examine the seismic behavior of thermally fractured Barre Granite undergoing mechanical damage and\/or rupture. Thermally cracked Barre granite cores (1.5\" diameter; 3\" length) are pre-stressed by increased deviatoric axial (sigma 1) load about 80% to failure. Subsequently we Increase pore pressure which will lead to successive failure. We record the seismic events during this process and categorize their characteristics using machine earning algorithms. Tests are conducted within a range of conditions (pp: 30MPa+ and cp: 40-90MPa) at 80C.", "uuid": "da4e76b0-df53-455f-afbf-992dfe521ef0", "experiments": [ { "facility": { "address": { "street": "77 Massachusetts Avenue", "building": "Bldg.54-715", "postcode": "02139", "city": "Cambridge", "state": "MA", "country": "USA", "latitude": "42.3601", "longitude": "71.0942" }, "contact": { "firstname": "Matej", "lastname": "Pec", "affiliation": "Professor", "email": "mpec@mit.edu", "phone": "617-324-7279", "website": "https:\/\/mpec.scripts.mit.edu\/peclab\/", "id": "" }, "institute": "Massachusetts Institute of Technology", "department": "Earth and Planetary Sciences (EAPS)", "name": "Rock Physics Laboratory", "type": "University Lab", "other_type": "", "id": "ETH_54_715", "website": "https:\/\/eapsweb.mit.edu\/", "description": "This facility is located on the 7th Floor in the Green Building at MIT (E54). Besides basic research, we do provide external services for interested parties (academic and non-academic). For more information, please contact the laboratory administrator. " }, "apparatus": { "name": "NER Autolab 3000", "type": "Triaxial (conventional)", "other_type": "14", "location": "E54-715", "id": "MIT_NER3000", "description": "This apparatus was acquired in 2015 and is currently installed on the 7th floor of MIT EAPS (Fig. 3). This triaxial testing machine uses silicon oil as confining medium and allows for simultaneous measurements of permeability, resistivity, acoustic velocities, and mechanical properties of rocks at reservoir conditions. The large sample size (10 cm diameter x 20 cm length) allows up to sixteen acoustic transducers to be attached to the exterior of the rock samples; each may be used in either active or passive modes. Four additional built-in acoustic sensors are located along the sample axis. Acoustic data are collected in continuous streaming mode at 250 MS\/s. The mean-lithostatic and pore-fluid pressures are independently controlled up to 120 MPa; axial loads up to 4.89 MN can also be applied. An external furnace produces temperatures of up to 120\u02daC. Tests of mechanical failure, joint reactivation, hydraulic transmissivity and permeability, and hydrofracturing can be performed. We can also measure changes in acoustic wave velocity, locate acoustic emissions, and analyze the moment tensors of the events. \nThe NER 3000 apparatus supports a comprehensive suite of physical rock properties measurements as a function of stress and temperature. The system runs most standard rock mechanics test regimens, such as hydrostatic compression, pure shear, unconfined compression, confined compression, creep, and uniaxial strain. In addition, the system is equipped to measure permeability (Gas, Water) as well as resistivity. \nEach of these tests can be performed at pore pressures and temperatures representative of reservoir conditions. The apparatus is particularly suited for large samples including core drill sizes up to 4 inch diameter. Standard sample sizes are 4, 2, and 1.5\" diameter. The system is also equipped with three pore pressure ports (one electrically isolated) and 16x4 pins electrical feedthroughs. Part of the feedthroughs are specifically designed for acoustic measurements. End plugs with built in piezo source and receivers P, S-wave) are available for measuring axial velocities. ", "features": [ "Loading", "Unloading", "Heating", "High Pressure", "Hydrostatic Tests", "Elasticity", "Local Axial Strain", "Local Radial Strain", "Elastic Moduli", "Yield Strength", "Failure Strength", "Strength", "Creep", "Stepping", "Dynamic Tests", "Hydraulic Fracturing", "Reactive Flow", "Pore Fluid Control", "Permeability", "Steady-State Permeability", "Transient Permeability", "Drained\/Undrained Pore Fluid", "Uniaxial Stress\/Strain", "Triaxial Stress\/Strain", "Differential Stress", "Resistivity", "Electrical Resistivity", "Acoustic Velocity", "Acoustic Events", "P-Wave Velocity", "S-Wave Velocity", "Source Location" ], "parameters": [ { "type": "Confining Pressure", "min": "1", "max": "138", "unit": "MPa", "prefix": "-", "note": "" }, { "type": "Pore Pressure", "min": "1", "max": "129", "unit": "MPa", "prefix": "-", "note": "" }, { "type": "\u03c31-Load", "min": "0", "max": "2312", "unit": "kN", "prefix": "-", "note": "depends on confining pressure" }, { "type": "\u03c31-Displacement", "min": "0", "max": "25", "unit": "mm", "prefix": "-", "note": "10-35mm absolute" }, { "type": "Temperature", "min": "23", "max": "100", "unit": "degC", "prefix": "-", "note": "nominal 120C" }, { "type": "Permeability", "min": "0.01", "max": "100", "unit": "mDarcy", "prefix": "-", "note": "steady state" }, { "type": "Permeability", "min": "0.001", "max": "0.1", "unit": "mDarcy", "prefix": "-", "note": "transient" } ], "documents": [ { "type": "Picture", "other_type": "", "format": "png", "other_format": "", "path": "https:\/\/strabospot.org\/i\/c96b76cf-e62b-4e43-bbea-78ff0a51cc59\/20180105_130436.jpg", "id": "NER 3000_Im", "uuid": "c96b76cf-e62b-4e43-bbea-78ff0a51cc59", "description": "NER 3000 in E54-715" }, { "type": "Manual", "other_type": "", "format": "pdf", "other_format": "", "path": "https:\/\/strabospot.org\/i\/ddf5fa3d-d300-480c-bf33-1b191686c3b3\/AutoLab_3000_rev5.pdf", "id": "NER-3000_Man", "uuid": "ddf5fa3d-d300-480c-bf33-1b191686c3b3", "description": "NER 3000 Manual" } ] }, "daq": { "name": "NER 3000 DAQ + NI Continuous Acoustic + TiPie Triggered Acoustic", "type": "Proprietary", "location": "MIT E54-715", "description": "This setup uses the NER 3000 data system for mechanical data as well as the TiPie Setup for triggered AE responses (Wave Velocity+Events). 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Acoustic data are collected in continuous streaming mode at 250 MS\/s. The mean-lithostatic and pore-fluid pressures are independently controlled up to 120 MPa; axial loads up to 4.89 MN can also be applied. An external furnace produces temperatures of up to 120\u02daC. Tests of mechanical failure, joint reactivation, hydraulic transmissivity and permeability, and hydrofracturing can be performed. We can also measure changes in acoustic wave velocity, locate acoustic emissions, and analyze the moment tensors of the events. \nThe NER 3000 apparatus supports a comprehensive suite of physical rock properties measurements as a function of stress and temperature. The system runs most standard rock mechanics test regimens, such as hydrostatic compression, pure shear, unconfined compression, confined compression, creep, and uniaxial strain. 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