Attenuation tomography in the western central Andes: A detailed insight into the structure of a magmatic arc

Haberland, Christian; Rietbrock, Andreas

doi:10.1029/2000jb900472

Cited by 120 publications

(121 citation statements)

References 65 publications

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“…Attenuation is a physical parameter very sensitive to high temperatures and saturation of rocks with fluids and partial melting (Haberland and Rietbrock, 2001). Therefore, the relationship Q P =Q S is a better indicator of rock-fluid content than the velocity ratio V P =V S (Winkler and Nur, 1979).…”

Section: Resultsmentioning

confidence: 99%

An Attenuation Study of Body Waves in the South-Central Region of the Gulf of California, Mexico

Vidales-Basurto¹,

Castro²,

Huerta³

et al. 2014

Bulletin of the Seismological Society of America

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We studied the seismic attenuation of body waves in the south-central region of the Gulf of California (GoC) with records from the Network of Autonomously Recording Seismographs of Baja California (NARS-Baja), from the Centro de Investigación Científica y de Educación Superior de Ensenada's Broadband Seismological Network of the GoC (RESBAN), and from the ocean-bottom seismographs (OBS) deployed as part of the Sea of Cortez Ocean Bottom Array experiment (SCOOBA). We examine 27 well-located earthquakes reported in Sumy et al. (2013) that occurred from October 2005 to October 2006 with magnitudes (M w ) between 3.5 and 4.8. We estimated S-wave site effects by calculating horizontal-to-vertical spectral ratios and determined attenuation functions with a nonparametric model by inverting the observed spectral amplitudes of 21 frequencies between 0.13 and 12.59 Hz for the SCOOBA (OBS) stations and 19 frequencies between 0.16 and 7.94 Hz for NARS-Baja and RESBAN stations. We calculated the geometrical spreading and the attenuation (1=Q) factors for two distance intervals (10-120 and 120-220 km, respectively) for each frequency considered. The estimates of Q obtained with the SCOOBA (OBS) records for the interval 10-120 km indicate that the P waves attenuate more than S waves (Q P 34 1:2f 0:820:10 , Q S 59 1:1f 0:900:03 ) for frequencies between 0.6 and 12.6 Hz; whereas for the 120-220 km interval, where ray paths travel deeper, S waves attenuate more than P waves (Q P 117 1:3f 0:440:19 , Q S 51 1:2f 1:120:11 ). The estimates of Q obtained using NARS-Baja and RESBAN records, within 10-120 km, indicate that P waves attenuate more than S waves (Q P 69 1:2f 0:870:16 , Q S 176 1:4f 0:610:26 ) at frequencies between 0.3 and 6.3 Hz; whereas at the 120-220 km distance interval S waves attenuate slightly more than P waves (Q P 39 1:1f 0:640:06 , Q S 48 1:1f 0:370:07 ) at high frequencies (f > 3 Hz). These results, based on a unique OBS dataset, provide an indirect mean to constrain future models of the thermal structure beneath the GoC.

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Section: Resultsmentioning

confidence: 99%

An Attenuation Study of Body Waves in the South-Central Region of the Gulf of California, Mexico

Vidales-Basurto¹,

Castro²,

Huerta³

et al. 2014

Bulletin of the Seismological Society of America

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“…Steep Angle and wide angle reflection surveys (ANCORP Working Group, 1999;Lüth, 2000;ANCORP Working Group, 2003) and passive seismological networks PISCO 94 (Gräber and Asch, 1999), CINCA 95 (Husen et al, 1999;Patzig, 2000), ANCORP 96 (Haberland and Rietbrock, 2001;ANCORP Working Group, 2003), PUNA97 (Schurr et al, 1999;Schurr, 2000;Schurr et al, 2003;Schurr and Rietbrock, 2004;Schurr et al, 2006), were operated to obtain receiver function (e.g. Yuan et al, 2000) and local tomographic images (e.g.…”

Section: The Central Andes At 21°s and The Altiplano Plateaumentioning

confidence: 99%

More constraints to determine the seismic structure beneath the Central Andes at 21°S using teleseismic tomography analysis

Heit¹,

Koulakov²,

Asch³

et al. 2008

Journal of South American Earth Sciences

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A set of seismological stations was deployed in the Central Andes region along a ~600 km long profile at 21°S between Chile and Bolivia and operated for a period of almost two years, from March 2002 to January 2004. Here we present the results of the tomographic inversion for P-wave velocity anomalies, based on teleseismic data recorded at the stations. The reliability of the results has been checked by a series of synthetic tests. The tomographic images show high-velocities on the west of the profile that are indicative of cold material from the fore-arc. A low-velocity anomaly is detected at the border between the fore-and the volcanic arc where the Quebrada Blanca seismic anomaly was previously described. This anomaly might be related to the presence of fluids that originate at the cluster of earthquakes at a depth of ~100 km in the subducted plate. A strong low-velocity anomaly is detected beneath the entire Altiplano plateau and part of the Eastern Cordillera, in agreement with previous receiver function results. The Brazilian Shield is thought to be responsible for the strong high-velocity anomaly underneath the Interandean and Subandean regions.

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“…Amplitude is influenced by several factors such as the size of the event, station site and instrument gain, geometrical spreading, and seismic attenuation. With these, the total amplitude can be written as (e.g., Sanders, 1993;Haberland and Rietbrock, 2001):…”

Section: Methodsmentioning

confidence: 99%

“…The attenuation of S waves, B ij ( f, R), is attributed to the quality factor Q. We assume a frequency dependent Q and model it as an exponential decay (e.g., Sanders, 1993;Haberland and Rietbrock, 2001):…”

Section: Methodsmentioning

confidence: 99%

“…Lg wave data have also been applied to attenuation tomography (e.g., Mitchell et al, 1997;Phillips et al, 2000Phillips et al, , 2001Phillips et al, , 2005aCong et al, 2003;Taylor et al, 2003;Liu et al, 2004a, b). Tomographic inversion for regional imaging of Q has been performed in earlier studies using limited waveform data sets (e.g., Haberland and Rietbrock, 2001;Liu et al, 2004b;Phillips et al, 2005a). These researches show low resolution because of small data set in a large area.…”

Section: Introductionmentioning

confidence: 99%

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The updated crustal attenuation in North China using ML amplitude tomography

Pei

Chen

2010

Earthq Sci

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We have updated the lateral variations of the quality factor Q 0 (Q at 1 Hz) beneath the crust of North China using M L amplitude tomography with near three times data. The data were selected from the Annual Bulletin of Chinese Earthquakes (ABCE) in 1985−2009, including 26 283 M L amplitude readings from 4 204 events recorded by 38 stations. The result is similar with previous research but has higher resolution. Estimated Q 0 values are consistent with tectonic and topographic structure in North China. Q 0 is low in the active tectonic regions having many faults, such as Bohai bay, North China basin, the Shanxi and Yinchuan grabens, while it is high in the stable Ordos craton. Q 0 values are low in several topographically low-lying areas, such as the North China, Taikang-Hefei, and Subei-Huanghai Sea basins, whereas it is high in mountainous and uplift regions exhibiting surface expressions of crystalline basement rocks: the Yinshan, Yanshan, Taihang, Qinling and Dabie mountains, Luxi and Jiaoliao uplifts. Quality factor estimates are also consistent with Pn and Sn velocity patterns. High velocity values in general correspond with high Q 0 and vice versa. This coincides with a common temperature influence in the crust and uppermost mantle.

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Attenuation tomography in the western central Andes: A detailed insight into the structure of a magmatic arc

Cited by 120 publications

References 65 publications

An Attenuation Study of Body Waves in the South-Central Region of the Gulf of California, Mexico

An Attenuation Study of Body Waves in the South-Central Region of the Gulf of California, Mexico

More constraints to determine the seismic structure beneath the Central Andes at 21°S using teleseismic tomography analysis

The updated crustal attenuation in North China using ML amplitude tomography

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