Seismological investigation of crack formation in hydraulic rock fracturing experiments and in natural geothermal environments. Progress report, September 1, 1981-August 31, 1982

Technical Report · Wed Sep 01 04:00:00 EDT 1982

DOI:https://doi.org/10.2172/5118997· OSTI ID:5118997

Aki, K

Accomplishments during the present reporting period are: high-quality digital data obtained in the crater and the flank of Mt. St. Helens by the deployment of 9 event-recorders; discovery of striking differences in arrival times and amplitudes of seismic events between the crater station and flank stations; successful interpretation of the above observations by a powerful new method of seismogram synthesis called Gaussian Beam Method; evidence obtained at Mt. St. Helens for a close connection between the volcanic tremor and so-called long-period events; further development of our volcanic tremor model by including acoustic vibration in magma; and development of a high-temperature small-diameter borehole seismograph for use in search of a magma reservoir by listening to seismic events due to thermal stress.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• DOE Contract Number: AC02-76ER02534
• OSTI ID: 5118997
• Report Number(s): DOE/ER/02534-8; COO-2534-8; ON: DE82021615
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150301 -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
150906* -- Geothermal Engineering-- Reservoir Stimulation & Extraction Technology
58 GEOSCIENCES
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
CASCADE MOUNTAINS
COMMINUTION
CRACKS
DATA ANALYSIS
FEDERAL REGION X
FRACTURING
GEOLOGIC MODELS
GEOPHYSICAL SURVEYS
Geothermal Legacy
HYDRAULIC FRACTURING
MOUNTAINS
MT ST HELENS
NORTH AMERICA
SEISMIC EVENTS
SEISMIC SURVEYS
SEISMICITY
SURVEYS
USA
WASHINGTON