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QuakeFinder is a company focused on developing a system for earthquake prediction. QuakeFinder operates as a for-profit R&D division of Stellar Solutions and is funded by Stellar Solutions, by grants from NASA,〔See, e.g., results of search on grant number NNX08AF11G at (【引用サイトリンク】 publisher = NASA Shared Services Center - Customer Services Web - Grants Status Search )〕 and by subscriptions and sponsorships from the public.〔Note however that, according to IRS Publication 78 ("Cumulative List of Organizations described in Section 170(c) of the Internal Revenue Code of 1986" ()) Quakefinder is not a tax-exempt organization.〕 QuakeFinder has developed science, technology, infrastructure and expertise that it intends as the foundation for a practical earthquake forecasting solution based on detection of geophysical and atmospheric phenomena. The QuakeFinder researchers believe that they have observed a dramatic increase in the number of ultra low frequency magnetic pulses emitted by the earth near the locations of impending earthquakes, starting two weeks prior to the event and lasting for one or two days. The team also believes that observations of air conductivity changes and infrared emissions coincident with the pulses corroborate the results. Researchers from the USGS studied similar phenomena during the Parkfield earthquake experiment. These researchers did not find evidence of electromagnetic earthquake precursors. A possible explanation for QuakeFinder's observations is that slip along a fault activates charge carriers and underground electrical currents, producing electromagnetic pulses that can be detected with magnetometers. The stress of the rocks pushing against each other also produces an increase in positive ions, which migrate through the ground into the air where they can be detected with sensitive air-conductivity sensors. It has been claimed that neutralization of these ions in the air gives off infrared radiation that shows up as "apparent heating" at night, when the ground should be cooling, as detected by NASA’s GOES weather satellite. The QuakeFinder team believes that the effects they are trying to study are localized in time and space, and aim to eventually be able determine "the time (within 1-2 weeks), location (within 20-40km) and magnitude (within +/- 1 increment of Richter magnitude) of earthquake greater than M5.4." There is no independent verification of their results so far. And, indeed, insofar as a verifiable prediction would amount to a public-stated announcement of the location, time, and size of an impending event before its occurrence, Quakefinder has not yet actually predicted an earthquake, and they have not issued multiple predictions of the type that might be objectively testable for statistical significance. QuakeFinder has deployed a network of sensors that detect the electromagnetic effects the team believes precede major earthquakes.〔 Each sensor is believed to have a range of approximately 10 miles (16 km) from the instrument to the source of the pulses, and includes instrumentation to detect 3 axes of magnetic field disturbances, 2 types of ions in the air, a geophone to detect mechanical disturbances, temperature and relative humidity sensors, and associated data acquisition and transmission equipment. The sensors collect and store the data locally, and then transmit the raw data to the QuakeFinder Data Center in Palo Alto, Ca. The network raw data that are automatically analyzed by proprietary algorithms invented and developed by QuakeFinder. The company's website provides plots of Quakefinder data, but numerical data values are not openly available to the public, thus making it impossible for other scientists to scrutinize Quakefinder claims of success. According to its news releases, the QuakeFinder network currently includes more than 70 sensors in California, 2 in Peru and 2 in Taiwan. More instruments will be added in 2011 in Peru, Taiwan, Greece, and Turkey. == See also == * Earthquake light * Earthquake warning system * Quakesat 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「QuakeFinder」の詳細全文を読む スポンサード リンク
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