Description

Proximity Acoustic Emission (AE) doublets analysis is used for subsurface fracture measurement. AE is a microseismic event. Location and shape of subsurface fracture is estimated from distribution of AE sources. Measurement of subsurface fracture is important in many areas of human activities associating with the Earth. Motion of subsurface fracture causes earthquakes. Geothermal energy is extracted from subsurface fracture reservoirs in which steam and hot water are stored. Carbon dioxide is also stored in tiny spaces of subsurface fracture. Proximity AE doublet analysis is a new method in which fine structures of subsurface fracture can be estimated. Proximity AE doublets have a similar waveform, and they occur in a succession with an interval that is less than 1 s. Accurate relative location between AE sources can be realized because a medium, in which AE waves propagate, does not change during the interval. Intervals of P-wave and S-wave between proximity AE doublets are detected in cepstrum analysis. Proximity AE doublets have one or two peaks at their intervals in their cepstrum. In my analysis I also show relative locations between AE sources of proximity AE doublets.

Start Date

8-3-2008 8:00 AM

End Date

8-3-2008 5:00 PM

Subject - LCSH

Seismic event location; Acoustic emission;

Genre/Form

Conference Papers and Proceedings

Session

Near-Surface Processes

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.

Digital Format

application/pdf

Language

English

Type

event

Included in

Geography Commons

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Mar 8th, 8:00 AM Mar 8th, 5:00 PM

Proximity AE doublets analysis for subsurface fracture measurement.

Proximity Acoustic Emission (AE) doublets analysis is used for subsurface fracture measurement. AE is a microseismic event. Location and shape of subsurface fracture is estimated from distribution of AE sources. Measurement of subsurface fracture is important in many areas of human activities associating with the Earth. Motion of subsurface fracture causes earthquakes. Geothermal energy is extracted from subsurface fracture reservoirs in which steam and hot water are stored. Carbon dioxide is also stored in tiny spaces of subsurface fracture. Proximity AE doublet analysis is a new method in which fine structures of subsurface fracture can be estimated. Proximity AE doublets have a similar waveform, and they occur in a succession with an interval that is less than 1 s. Accurate relative location between AE sources can be realized because a medium, in which AE waves propagate, does not change during the interval. Intervals of P-wave and S-wave between proximity AE doublets are detected in cepstrum analysis. Proximity AE doublets have one or two peaks at their intervals in their cepstrum. In my analysis I also show relative locations between AE sources of proximity AE doublets.