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Long Term Electromagnetic Monitoring at Parkfield CA



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Electric and magnetic fields in the ULF band were monitored at two sites adjacent to the San Andreas Fault near Parkfield and Hollister, California. A data window enclosing the September 28, 2004 M6 Parkfield earthquake, was analyzed to determine if anomalous electric or magnetic fields, or changes in ground conductivity, occurred before the earthquake. Three main statistical techniques were employed to separate local anomalous electrical or magnetic fields from the dominant coherent natural fields: transfer function and residual field estimates between components at each site; principal component analysis; and canonical coherence analysis were employed to distinguish anomalous fields which are spatially broad from those which occur at a single site only, and to distinguish signals present in both the electric and magnetic fields from those which are present in only one field type. Standard remote reference apparent resistivity estimates were generated daily at Parkfield. In all cases, high levels of sensitivity to subtle electromagnetic effects were demonstrated, but no effects which can be reasonably characterized as precursors to the Parkfield earthquake were found.






Electric and magnetic fields in the ULF band were monitored at two sites adjacent to the San Andreas Fault near Parkfield and Hollister, California. A data window enclosing the September 28, 2004 M6 Parkfield earthquake, was analyzed to determine if anomalous electric or magnetic fields, or changes in ground conductivity, occurred before the earthquake. Three main statistical techniques were employed to separate local anomalous electrical or magnetic fields from the dominant coherent natural fields: transfer function and residual field estimates between components at each site; principal component analysis; and canonical coherence analysis were employed to distinguish anomalous fields which are spatially broad from those which occur at a single site only, and to distinguish signals present in both the electric and magnetic fields from those which are present in only one field type. Standard remote reference apparent resistivity estimates were generated daily at Parkfield. In all cases, high levels of sensitivity to subtle electromagnetic effects were demonstrated, but no effects which can be reasonably characterized as precursors to the Parkfield earthquake were found.


With more precise dosing and newer methods of delivery older studies may overestimate the risks. OSTI.GOV Journal Article Longterm monitoring of ULF electromagnetic fields at Parkfield CA Title Longterm monitoring of ULF electromagnetic fields at Parkfield CA Full Record . A data window enclosing the Septem M6 Parkfield earthquake was analyzed to determine if anomalous electric or magnetic fields or changes in ground conductivity occurred before the. to the San Andreas Fault near Parkfield and Hollister California from 1995 .


Parkfield

A data window enclosing theSeptem M6 Parkfield earthquake was analyzed to determine if anomalous electric or magnetic fields. Compra Libros SIN IVA en Buscalibre. by Y Gao 2016 Cited by 29 electromagnetic EM monitoring sites on the San Andreas Fault . Scopri Long Term Electromagnetic Monitoring at Parkfield CA di Kappler Karl spedizione gratuita per i clienti Prime e per ordini a partire da 29 spediti da Amazon. The Parkfield ExperimentCapturing What Happens in an Earthquake. Read Long Term Electromagnetic Monitoring at Parkfield CA book reviews author details and more at Amazon.in. for much of the past 7 years with sites near Hollister and Parkfield CA. ParkfieldHollister electromagnetic monitoring array. Best Sellers Prime New Releases Customer Service.


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