A Shallow Crustal Earthquake Doublet from the Trans-Mexican Volcanic Belt (Central Mexico)

Quintanar, Luis; Rodríguez-González, Miguel; Campos-Enríquez, Oscar

doi:10.1785/0120030057

Cited by 28 publications

(11 citation statements)

References 21 publications

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“…The Trans‐Mexican Volcanic Belt (TMVB) is the most significant geological feature in central Mexico. This elongated structure extends for 220 km from one coast of the country to the other with an average width of 70 km (Quintanar et al 2004; Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Velocity structure under the Trans-Mexican Volcanic Belt: preliminary results using correlation of noise

Chávez-García¹,

Quintanar

2010

Geophysical Journal International

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S U M M A R YPrediction of ground motion in central Mexico is of great consequence not only for Mexico City but also for several other cities in the region. However, the geometry and velocity distribution of the geological structures in central Mexico is unknown. In this paper, the velocity structure in central Mexico is investigated using seismic noise records from three different arrays, one permanent and two temporary. Distances between stations span 3-300 km. Seismic noise is analysed using time domain cross-correlation to estimate the Green's function between stations. Only the fundamental mode of Rayleigh waves is recovered in the cross-correlation of vertical component records, between 5 and 10 s period. At smaller periods, we obtain no correlation, even between closely spaced stations. This suggests that the heterogeneity of the Trans-Mexican Volcanic Belt (TMVB) hampers the propagation of Rayleigh waves smaller than 9 km. We observe a large velocity contrast between the Guerrero terrain and the TMVB. This velocity contrast, measured here for the first time at this scale, explains the appearance of regional amplification in central Mexico and the origin of the diffracted waves behind the long duration of ground motion observed in Mexico City. In the large scale, average Rayleigh wave group velocity at 5 s period is about 2.5 km s −1 in the TMVB and larger than 3.6 km s −1 outside it. Significant lateral heterogeneity is evident. In the stations of the dense Meso-American Subduction Experiment array we analysed, we observe in addition a significant increase in velocity from north to south in the central portion of the TMVB. Our results are part of ongoing studies with the final objective of building a model of TMVB that may be used to simulate ground motion in central Mexico from subduction zone earthquakes.

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Section: Introductionmentioning

confidence: 99%

Velocity structure under the Trans-Mexican Volcanic Belt: preliminary results using correlation of noise

Chávez-García¹,

Quintanar

2010

Geophysical Journal International

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“…El graben está limitado al norte por la falla Cardonal que llega a afectar a rocas con edades mayores a los 4.6 Ma (Suter et al, 2001). Sin embargo, y aunque la sismicidad es difusa en el área, la presencia de dos eventos sísmicos de magnitud (Mw) ~5 indican que esta estructura es potencialmente activa (Suter et al, 1996;Quintanar et al, 2004). Por su parte, García-Palomo et al (2002) describen varias fallas normales de dirección NE en el campo volcánico de Apan (Lámina 1).…”

Section: Geología Estructural Y Neotectónicaunclassified

Petrogénesis ígnea de la Faja Volcánica Transmexicana

Gómez-Tuena¹,

Orozco-Esquivel²,

Ferrari³

2005

BSGM

108

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C i e n A ñ o s ResumenLa extraordinaria diversidad magmática de la Faja Volcánica Transmexicana está controlada (directa o indirectamente) por dos placas oceánicas independientes cuyos parámetros geofísicos y composicionales se modifi can constantemente a lo largo de la trinchera, por un régimen tectónico esencialmente distensivo que opera con distinta intensidad sobre la placa continental, por un basamento cortical con diferentes edades, espesores y composiciones, y por una fuente mantélica primaria de composición extremadamente variable que ha sido infl uenciada, en mayor o menor medida, por los agentes químicos derivados de la subducción. El régimen tectónico convergente y, en consecuencia, el arco magmático, tampoco han evolucionado de forma homogénea a lo largo su historia, sino que han mostrado transformaciones notables en su posición, geometría y composición. Por estos motivos, la Faja Volcánica Transmexicana es el resultado de uno de los sistemas tectónicos convergentes más complejos del planeta, el objeto de más de un siglo de investigaciones científi cas, y también el centro de las controversias más notables sobre la geología mexicana.Palabras clave: Faja Volcánica Transmexicana, México, subducción, arco magmático, petrología ígnea, manto, corteza. Abstract The magmatic diversity of the Transmexican Volcanic Belt is directly or indirectly controlled by two independent oce-

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“…One of the most interesting signal based studies are those dealing with repeated earthquakes with common shapes of recordings and clustered on particular areas. Doublets or more wider multiplets of events are often observed on active tectonic zones (e.g., Kagan and Jackson 1999), low-seismicity and volcanic areas (e.g., Gregersen et al 2007;Quintanar et al 2004) or human induced seismicity (e.g., Gibowicz 2006;Wehling-Benatelli et al 2013) and provide a possibility to improve seismological analysis. Some conditions have to be fulfilled for multiplets in a sense of waveform similarities (Geller and Mueller 1980): two events should have almost the same location, with separation less than one quarter of the shortest wavelength (k/4-criterion) also both source mechanisms and source time functions (STF) should be very similar.…”

Section: Introductionmentioning

confidence: 99%

Identification of seismic doublets occurred on Rudna mine, Poland

2017

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Seismic events with similar focal mechanisms and similarity of Green's functions exhibit common waveform shapes recorded on the same seismic station. The similarity of seismograms can also be observed in the case of man-induced seismicity on the continuous excavated area. In this work, we focused on strong and potential mininginduced seismic doublets, our study was using concepts of signal analysis, using an in-mine network with quite low dynamic range. Since in such case records for strong events are usually affected by clipping, signal analysis were performed with both raw signal cross-correlation (CC) and binary signal cross-correlation (BCC). We found that for events which fulfilled the established criteria, waveform similarities are significantly higher than for other possible doublets. Using BCC and CC approaches, we noticed crucial influences of double couple nodal planes' as well as P and T axis orientations on waveform similarities although the focal mechanisms were characterized by very high non-double couple components. Finally analysis confirmed that human activity represented by mining is able to produce strong (M [ 3) repeating mining tremors.

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A Shallow Crustal Earthquake Doublet from the Trans-Mexican Volcanic Belt (Central Mexico)

Cited by 28 publications

References 21 publications

Velocity structure under the Trans-Mexican Volcanic Belt: preliminary results using correlation of noise

Velocity structure under the Trans-Mexican Volcanic Belt: preliminary results using correlation of noise

Petrogénesis ígnea de la Faja Volcánica Transmexicana

Identification of seismic doublets occurred on Rudna mine, Poland

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