Three Dimensional Attenuation Tomography from Microseismicity

Calixto, Frank J.; Baan, Mirko van der

doi:10.1190/segam2015-5829881.1

Cited by 2 publications

References 11 publications

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Attenuation tomography using recorded microseismicity in a mine

Barthwal

Calixto²,

Baan

2019

SEG Technical Program Expanded Abstracts 2019

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We perform three-dimensional attenuation tomography using microseismic data recorded during an underground mine development. The whole path attenuation parameter t * is obtained by least-squares inversion of P-wave amplitude spectra of the events recorded by 7 monitoring wells each containing 4 3C geophones. For tomographic inversion, we use 292 events out of the total 488 identified events for which the corner frequencies ranged between 120 to 210 Hz. The inverted quality factor Q varies between 9 to 100 with the event cluster location characterized by low Q value of 10. Two high Q regions of 45-55 are located, one between 0 to 0.2 km East and 0.3 to 0.5 km North, and another centered around 0.5 km East and 0.25 km North. The high (-low) Q values show a good correlation with the high (-low) velocities present in the velocity tomography model. Thus, the attenuation model can reveal heterogeneity present within the mine thereby providing valuable geological insights in regions not accessible for direct sampling.

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Attenuation tomography using recorded microseismicity in a mine

Barthwal

Calixto²,

Baan

2019

SEG Technical Program Expanded Abstracts 2019

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Spectral Characteristics of Hydraulic Fracturing-Induced Seismicity Can Distinguish between Activation of Faults and Fractures

Igonin

Trugman

Gonzalez

et al. 2023

Seismological Research Letters

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Analysis of earthquake spectra can aid in understanding source characteristics like stress drop and rupture complexity. There is growing interest in probing the similarities and differences of fault rupture for natural and human-induced seismic events. Here, we analyze waveform data from a shallow, buried geophone array that recorded seismicity during a hydraulic fracturing operation near Fox Creek, Alberta. Starting from a quality-controlled catalog of 4000 events between magnitude 0 and 3.2, we estimate source-spectral corner frequencies using methods that account for the band-limited nature of the sensor response. The stress-drop values are found to be approximately self-similar, but with a slight magnitude dependence in which larger events have higher stress drop (∼10 MPa). Careful analysis of the relative corner frequencies shows that individual fault and fracture segments experienced systematic variations in relative corner frequency over time, indicating a possible change in the stress state. Clustering analysis of source spectra based on the relative proportion of high- and low-frequency content relative to the Brune model further shows that event complexity evolves over time. In addition, the faults produce earthquakes with systematically larger stress-drop values than the fractures. Combined, these results indicate that the features activated by hydraulic fracturing experience observable changes in source behavior over time and exhibit different properties depending on the orientation, scale, and fabric of the structural feature on which they occur.

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Three Dimensional Attenuation Tomography from Microseismicity

Cited by 2 publications

References 11 publications

Attenuation tomography using recorded microseismicity in a mine

Attenuation tomography using recorded microseismicity in a mine

Spectral Characteristics of Hydraulic Fracturing-Induced Seismicity Can Distinguish between Activation of Faults and Fractures

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