Seismological investigation of crack formation in hydraulic rock fracturing experiments and in natural geothermal environments. Progress report, September 1, 1977--August 31, 1978

Technical Report · Fri Sep 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6169880· OSTI ID:6169880

Aki, K

New seismological methods were developed for determining the structure of a geothermal energy source region by the use of data from both active and passive experiments. Technical papers were published on four topics, namely: a field experiment at Kilauea Iki, source models of volcanic tremors, microearthquake source spectra, and a numerical study of elastic wave diffraction by fluid-filled cracks. In addition, papers were submitted for publication on a statistical synthesis of source mechanism of seismic events in Kilauea Iki and the observation of a temporal variation in the attenuation of earthquake coda in central California. The following subjects were worked on: (1) interpretation of seismic data from the LASL Hot Dry Rock system; (2) analyisis of volcanic tremor data from the U.S.G.S. Hawaiian seismic network; (3) frequency dependence and three-dimensional distribution of seismic attenuation in central Japan; (4) experimental study of seismic scattering by a penny-shaped crack; (5) development of a microprocessor system for the treatment of the data from digital event recorders.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• DOE Contract Number: EY-76-S-02-2534
• OSTI ID: 6169880
• Report Number(s): COO-2534-4
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
ASIA
COHERENT SCATTERING
COMMINUTION
CRACKS
DIFFRACTION
EARTHQUAKES
FRACTURING
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
GEOTHERMAL SYSTEMS
Geothermal Legacy
HAWAII
HOT-DRY-ROCK SYSTEMS
HYDRAULIC FRACTURING
JAPAN
MATHEMATICAL MODELS
MICROEARTHQUAKES
MICROPROCESSORS
NORTH AMERICA
SCATTERING
SEISMIC EVENTS
SEISMIC SURVEYS
SEISMOLOGY
USA
WESTERN REGION