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1

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Time reverse location of seismic long-period events recorded on Mt Etna (2012)

O’Brien, G. S. ; Lokmer, I. ; De Barros, L. ; [et al.]

Wiley

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Publication Date: 2017-04-04

Description: We present the first application of a time reverse location method in a volcanic setting, for a family of long-period (LP) events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From 2008 June 18 to July 3, 50 broad-band seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of LP events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two LP families we first applied the method to two synthetic data sets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.

Description: Published

Description: 452-462

Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive

Description: JCR Journal

Description: reserved

Keywords: Volcano seismology ; Computational seismology ; Wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Type: article

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2

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Depth-dependent intrinsic and scattering seismic attenuation in north central Italy (2011)

Del Pezzo, E. ; Bianco, F. ; Marzorati, S. ; [et al.]

Wiley

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Publication Date: 2017-04-04

Description: In this study the attenuation mechanism of seismic wave energy in north central Italy is estimated using low-magnitude earthquake local data recorded at six stations managed by INGV. Most of the analysed events are located along the Alpine chain in the zone of Iseo and Garda lakes, while a minor part in the Po valley. The zone investigated is characterized by the occurrence of significantly intense earthquakes (magnitude up to 6.6) the most recent occurred in 2004 close to the city of Sal`o on the coast of the Garda lake (Mw = 5.0). Due to the high population density and presence of industrial activity the investigated area is characterized by a high seismic risk. First, the ordinary Multiple Lapse Time Window Analysis (MLTWA) method is applied in the assumption of uniformvelocity and scattering and the couple of B0, the seismic albedo and Le−1, the extinction length inverse (corresponding to the total attenuation coefficient) is calculated in the frequency bands of 1.5, 3, 6 and 12 Hz. To retrieve more realistic estimates, the obtained values of B0 and Le−1 are corrected taking into account the effects of a depth-dependent earth model, consisting of an earth structure characterized by a transparent upper mantle and a heterogeneous crust. We find that the corrected intrinsic and scattering attenuation parameters (which are proportional to the inverse of the intrinsic/scattering quality factors, QI−1 and Qs−1) are strongly frequency dependent, with a prevalence of scattering attenuation over the intrinsic dissipation. The corrected and uncorrected values of total Q are in agreement with the total Q values obtained with different approaches for the same area.

Description: Published

Description: 3.1. Fisica dei terremoti

Description: JCR Journal

Description: reserved

Keywords: Seismic Attenuation ; Coda Waves ; Wave Scattering and Diffraction ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

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3

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Time reverse location of seismic long-period events recorded on Mt Etna (2011)

O’Brien, G. S. ; Lokmer, I. ; De Barros, L. ; [et al.]

Wiley

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Publication Date: 2017-04-04

Description: We present the first application of a time reverse location method in a volcanic setting, for a family of long-period (LP) events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From 2008 June 18 to July 3, 50 broad-band seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of LP events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two LP families we first applied the method to two synthetic data sets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.

Description: In press

Description: (11)

Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive

Description: JCR Journal

Description: reserved

Keywords: Volcano seismology ; Computational seismology ; Wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Type: article

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4

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A new petrophysical interpretation model for clastic rocks based on NMR, epithermal neutron and electromagnetic logs (1996)

P. Gossenberg ; G. Galli ; M. Andreani ; [et al.]

Soc. Professional Well Log Analysts

In: Extended abstract at the 37th Annual Logging Symposium of SPWLA, Denver, Soc. Professional Well Log Analysts, vol. 1, no. paper SPWLA 90-C, pp. M1-M4, (ISBN 3-933346-037)

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Publication Date: 1996

Keywords: Physical properties of rocks ; Borehole geophys. ; Applied geophysics ; NMR ; NML ; Conference abstr.

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5

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A new, simplified, unified technique for the analysis of wireline formation test data (1996)

E. Kasap ; D. Georgi ; J. Michaels ; [et al.]

Soc. Professional Well Log Analysts

In: Extended abstract at the 37th Annual Logging Symposium of SPWLA, Washington, D.C., Soc. Professional Well Log Analysts, vol. C 560, 183 pp., no. 57, pp. AA1-AA13, (ISBN 3-933346-037)

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Publication Date: 1996

Keywords: Borehole geophys. ; Applied geophysics ; Data analysis / ~ processing ; Fluids ; Conference abstr.

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6

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Supercharge pressure compensation with new wireline formation testing method (1996)

M. A. Proett ; W. C. Chin

Soc. Professional Well Log Analysts

In: Extended abstract at the 37th Annual Logging Symposium of SPWLA, Menlo Park, California, Soc. Professional Well Log Analysts, vol. 1034, no. 77-3, pp. Z1-Z13, (ISBN 3-933346-037)

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Publication Date: 1996

Keywords: Borehole geophys. ; Applied geophysics ; Stress ; Data analysis / ~ processing ; Fluids ; Conference abstr.

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7

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The MRIL log in a low porosity and permeability formation (1996)

J. R. Hook ; P. B. Basan ; B. D. Lowden

Soc. Professional Well Log Analysts

In: Extended abstract at the 37th Annual Logging Symposium of SPWLA, Hannover, Soc. Professional Well Log Analysts, vol. C 560, 183 pp., no. 23, pp. N1-N13, (ISBN 3-933346-037)

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Publication Date: 1996

Keywords: Physical properties of rocks ; Borehole geophys. ; Applied geophysics ; NMR ; NML ; Conference abstr.

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8

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Applying pulse-echo NMR to shaly sand formation evaluation (1994)

G. R. Coates ; J. S. Gardner ; D. L. Miller

Soc. Professional Well Log Analysts

In: Paper presented at the National SPWLA Convention, Tulsa, Oklahoma, Soc. Professional Well Log Analysts, vol. 10, no. GL-TR-89-0314, pp. 627-635

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Publication Date: 1994

Keywords: Borehole geophys. ; Applied geophysics ; NML ; Fluids

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9

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The MRIL in Conoco 33-1: An investigation of a new magnetic resonance imaging log (1991)

G. R. Coates ; M. Miller ; M. Gillen ; [et al.]

Soc. Professional Well Log Analysts

In: Paper presented at the National SPWLA Convention, Midland, Texas, Soc. Professional Well Log Analysts, vol. 10, no. GL-TR-89-0314, pp. 627-635

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Publication Date: 1991

Keywords: Borehole geophys. ; Applied geophysics ; NML ; Instruments ; Fluids

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BIBLIOGRAPHY SEISMOLOGY

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10

Unknown

Application of dip-related measurements to a complex carbonate-clastic depositional environment (1990)

E. L. Bigelow ; E. A. Beaumont

Am. Assoc. Petrol. Geologists

In: Professional Paper, Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 14, no. 16, pp. 527-548, (ISBN 0080419208)

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Publication Date: 1990

Keywords: Applied geophysics ; Borehole geophys. ; Dipmeter, ~analysis ; Layers ; orientation

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11

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Reservoir delineation by wireline techniques (1990)

J. F. Goetz ; W. J. Prins ; J. F. Logar ; [et al.]

Am. Assoc. Petrol. Geologists

In: Professional Paper, Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 23, no. 16, pp. 498-526, (ISBN: 3-540-23712-7)

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Publication Date: 1990

Keywords: Applied geophysics ; Borehole geophys. ; porosity ; conductivity

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12

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Formation evaluation (1990)

G. E. Archie ; E. A. Beaumont

Am. Assoc. Petrol. Geologists

In: Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 37, no. 16, pp. 22-30, (ISBN 0080419208)

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Publication Date: 1990

Keywords: Borehole geophys. ; Applied geophysics ; Review article ; porosity ; conductivity

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13

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Making more intelligent use of log derived dip information; part IV: structural interpretation (1990)

E. L. Bigelow ; E. A. Beaumont

Am. Assoc. Petrol. Geologists

In: Professional Paper, Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 14, no. 16, pp. 475-497, (ISBN 0080419208)

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Publication Date: 1990

Keywords: Borehole geophys. ; Applied geophysics ; Dipmeter, ~analysis ; Layers ; orientation

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14

Unknown

A history of well logging (1990)

H. M. Johnson ; E. A. Beaumont

Am. Assoc. Petrol. Geologists

In: Bull., Polar Proj. OP-O3A4, Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 14, no. 16, pp. 1-21, (ISBN: 3-540-23712-7)

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Publication Date: 1990

Keywords: Borehole geophys. ; Applied geophysics ; Handbook of geophysics

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15

Unknown

Downhole measurements while drilling (1990)

T. R. Bates, Jr. ; D. R. Tanguy ; E. A. Beaumont

Am. Assoc. Petrol. Geologists

In: Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 17, no. 16, pp. 645-654, (ISBN 0080419208)

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Publication Date: 1990

Keywords: MWD ; LWD ; Borehole geophys. ; Applied geophysics ; Engineering geophys.

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16

Unknown

Improved reservoir description through the integration of seismics, Vertical seismic profiling, and well logs (1990)

D. E. Roberts ; A. J. Winchester ; E. A. Beaumont

Am. Assoc. Petrol. Geologists

In: Bull., Open-File Rept., Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 10, no. 16, pp. 635-644, (ISBN 0080419208)

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Publication Date: 1990

Keywords: Applied geophysics ; Borehole geophys. ; Seismics (controlled source seismology)

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17

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Interpretation and application of borehole televiewer surveys (1990)

T. J. Taylor ; E. A. Beaumont

Am. Assoc. Petrol. Geologists

In: Professional Paper, Open-File Rept., Formation Evaluation I - Log Evaluation, Tulsa, Oklahoma, Am. Assoc. Petrol. Geologists, vol. 65, no. 16, pp. 591-609, (ISBN 1-86239-165-3, vi + 330 pp.)

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Publication Date: 1990

Keywords: Applied geophysics ; Borehole geophys. ; Borehole Televiewer ; Layers ; orientation

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