Scaling Relationships of Source Parameters of Mw 6.9-8.1 Earthquakes in the Cocos-Rivera-North American Subduction Zone

Ramírez‐Gaytán, Alejandro; Aguirre, Jorge; Jaimes, Miguel Á.; Huerfano, V.

doi:10.1785/0120130041

Cited by 8 publications

(8 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Earlier investigations of source-scaling properties based exclusively on rupture models lacked very large magnitude events (e.g., Somerville et al, 1999;Mai and Beroza, 2000). Other studies focused on region-specific scaling relationships (Murotani et al, 2008;Yen and Ma, 2011;Rodríguez-Pérez and Ottemöller, 2013;Ramírez-Gaytán et al, 2014) or a specific fault regime, like subduction events (Murotani et al, 2013;Skarlatoudis et al, 2016;Ye et al, 2016). Thus, there is a need to reexamine earthquake source-scaling properties using a global set of rupture models, considering different faulting regimes and including very large and megathrust events.…”

Section: Introductionmentioning

confidence: 99%

New Empirical Earthquake Source‐Scaling Laws

Thingbaijam

Martin

Goda

2017

Bulletin of the Seismological Society of America

239

175

View full text Add to dashboard Cite

We develop new empirical scaling laws for rupture width W, rupture length L, rupture area A, and average slip D, based on a large database of rupture models. The database incorporates recent earthquake source models in a wide magnitude range (M w 5.4-9.2) and events of various faulting styles. We apply general orthogonal regression, instead of ordinary least-squares regression, to account for measurement errors of all variables and to obtain mutually self-consistent relationships. We observe that L grows more rapidly with M w compared to W. The fault-aspect ratio (L=W) tends to increase with fault dip, which generally increases from reversefaulting, to normal-faulting, to strike-slip events. At the same time, subduction-interface earthquakes have significantly higher W (hence a larger rupture area A) compared to other faulting regimes. For strike-slip events, the growth of W with M w is strongly inhibited, whereas the scaling of L agrees with the L-model behavior (D correlated with L). However, at a regional scale for which seismogenic depth is essentially fixed, the scaling behavior corresponds to the W model (D not correlated with L). Selfsimilar scaling behavior with M w − log 10 A is observed to be consistent for all the cases, except for normal-faulting events. Interestingly, the ratio D=W (a proxy for average stress drop) tends to increase with M w , except for shallow crustal reversefaulting events, suggesting the possibility of scale-dependent stress drop. The observed variations in source-scaling properties for different faulting regimes can be interpreted in terms of geological and seismological factors. We find substantial differences between our new scaling relationships and those of previous studies. Therefore, our study provides critical updates on source-scaling relations needed in seismic-tsunami-hazard analysis and engineering applications. Electronic Supplement: Figures depicting regression analysis, normality probability plots, and comparisons between different source-scaling relationships; and tables listing rupture models and different earthquake source-scaling relationships.

show abstract

Section: Introductionmentioning

confidence: 99%

New Empirical Earthquake Source‐Scaling Laws

Thingbaijam

Martin

Goda

2017

Bulletin of the Seismological Society of America

239

175

View full text Add to dashboard Cite

show abstract

“…ej., Leonard, 2010) que relacionan los parámetros de la ruptura, como las dimensiones y el deslizamiento, al momento sísmico. Algunas de estas relaciones se han desarrollado específicamente para zonas de subducción (Somerville et al, 2002;Murotani et al, 2008;Blaser et al, 2010;Strasser et al, 2010;Ramírez-Gaytán et al, 2014). Ramírez-Gaytán et al (2014) derivaron relaciones empíricas de escalamiento para la zona de subducción de México a partir de modelos de ruptura determinados para siete sismos mayores o igual a MW 6.9 ocurridos de 1979 a 2003 y ubicados principalmente en la región de Guerrero-Colima-Michoacán.…”

Section: Implicaciones Para La Ruptura Sísmicaunclassified

“…Algunas de estas relaciones se han desarrollado específicamente para zonas de subducción (Somerville et al, 2002;Murotani et al, 2008;Blaser et al, 2010;Strasser et al, 2010;Ramírez-Gaytán et al, 2014). Ramírez-Gaytán et al (2014) derivaron relaciones empíricas de escalamiento para la zona de subducción de México a partir de modelos de ruptura determinados para siete sismos mayores o igual a MW 6.9 ocurridos de 1979 a 2003 y ubicados principalmente en la región de Guerrero-Colima-Michoacán. Sin embargo, las relaciones de Ramírez-Gaytán et al (2014) subestiman la magnitud del evento del 19 de septiembre 1985 si se asumen dimensiones consistentes con el modelo de ruptura determinado por Mendoza y Hartzell (1989).…”

Section: Implicaciones Para La Ruptura Sísmicaunclassified

“…Ramírez-Gaytán et al (2014) derivaron relaciones empíricas de escalamiento para la zona de subducción de México a partir de modelos de ruptura determinados para siete sismos mayores o igual a MW 6.9 ocurridos de 1979 a 2003 y ubicados principalmente en la región de Guerrero-Colima-Michoacán. Sin embargo, las relaciones de Ramírez-Gaytán et al (2014) subestiman la magnitud del evento del 19 de septiembre 1985 si se asumen dimensiones consistentes con el modelo de ruptura determinado por Mendoza y Hartzell (1989). Estas relaciones también subestiman la magnitud obtenida por Singh et al (1984) para el sismo de Jalisco del 3 de junio 1932 si se utilizan las dimensiones del área de réplicas para estimar la magnitud.…”

Section: Implicaciones Para La Ruptura Sísmicaunclassified

See 1 more Smart Citation

Acoplamiento sismogénico en la zona de subducción de MichoacánColima-Jalisco, México

López

Mendoza

2016

BSGM

View full text Add to dashboard Cite

Acoplamiento sismogénico en la zona de subducción México 199 Resumen Se analizaron los hipocentros y mecanismos focales de los sismos ocurridos en el suroeste de México entre 1964 y 2008 para examinar el ancho sismogénico de la zona de subducción de Michoacán-Colima-Jalisco. Esta zona incluye el segmento de Michoacán en la porción noroeste de la placa de Cocos y el segmento de Jalisco que corresponde a la placa de Rivera. En el segmento de Michoacán la profundidad máxima estimada para la zona de acoplamiento sismogénico es 40 km. Esta profundidad es mayor al valor de 25 km propuesto anteriormente para la placa de Cocos. Para la placa de Rivera la profundidad máxima del contacto sismogénico también es 40 km, consistente con el valor propuesto anteriormente. Este valor sugiere un ancho sismogénico distinto para cada segmento por la diferencia en el ángulo de buzamiento entre las placas de Cocos y de Rivera. Las dimensiones del contacto sismogénico estimadas para el segmento de Michoacán (300 km x 95 km) y para el segmento de Jalisco (420 km x 75 km) indican una magnitud máxima similar de Mw 8.3 con un deslizamiento promedio esperado de 2 m. Estos resultados tienen implicaciones importantes para la estimación del potencial sísmico en la zona de subducción de Michoacán-Colima-Jalisco.Palabras clave: Sismicidad, mecanismos focales, subducción en México, zona sismogénica. AbstractHypocenters and focal mechanisms of earthquakes in southwestern Mexico between 1964 and2008 were analyzed to examine the seismogenic width of the Michoacan-Colima-Jalisco subduction zone. This subduction zone includes the Michoacan segment in the northwest portion of the Cocos plate and the Jalisco segment, which corresponds to the Rivera plate. In the Michoacan segment, the maximum depth of seismogenic coupling is approximately 40 km. This depth is greater than the value of 25 km previously proposed for the entire Cocos plate. For the Rivera plate, the maximum seismogenic depth is also 40 km, consistent with the previously proposed value. This value suggests a different seismogenic width for each segment due to the difference in dip between the Cocos and Rivera plates. The dimensions of the seismogenic contact estimated for the Michoacan segment (300 km x 95 km) and for the Jalisco segment (420 km x 75 km) indicate a similar maximum magnitude of Mw 8.3 with an expected average slip of 2 m. These results have important implications for the estimation of the seismic potential in the Michoacan-Colima-Jalisco subduction zone.

show abstract

“…and the one proposed by Ramírez-Gaytán et al (2014), specifically developed for subduction events in México M wR = (2/3) * (log 10 A a /(7.78 * 1.0e − 9) (1/0.550) ) − 6.07 .…”

mentioning

confidence: 99%

The role of asperities in seismicity frequency-magnitude relations using the TREMOL v0.1.0. The case of the Guerrero-Oaxaca subduction zone, México

Monterrubio-Velasco

Zúñiga

Aguilar-Meléndez

et al. 2020

Preprint

View full text Add to dashboard Cite

Abstract. Seismicity and magnitude distributions are fundamental for any type of seismic hazard analysis. The Mexican subduction zone along the Pacific Coast is one of the most active seismic zones in the world. Some peculiar characteristics of the seismicity have been observed for a subregion of the subduction regime, which has been named SUB3 in a recent seismotectonic regionalization of the country, suggesting that the observed simplicity of this source arises from the rupturing of single asperities. In this work, we numerically test this hypothesis using the TREMOL (sThochastic Rupture Earthquake MOdeL) v0.1.0 code. As test cases, we choose four of the most significant events (6.5

show abstract

Scaling Relationships of Source Parameters of Mw 6.9-8.1 Earthquakes in the Cocos-Rivera-North American Subduction Zone

Cited by 8 publications

References 30 publications

New Empirical Earthquake Source‐Scaling Laws

New Empirical Earthquake Source‐Scaling Laws

Acoplamiento sismogénico en la zona de subducción de MichoacánColima-Jalisco, México

The role of asperities in seismicity frequency-magnitude relations using the TREMOL v0.1.0. The case of the Guerrero-Oaxaca subduction zone, México

Contact Info

Product

Resources

About