Crustal deformation measurements in Guerrero, Mexico

Larson, Kristine M.; Lowry, A. R.; Kostoglodov, V.; Hutton, W.; Sánchez, Osvaldo; Hudnut, K. W.; Suárez, Gerardo

doi:10.1029/2003jb002843

Cited by 98 publications

(105 citation statements)

References 46 publications

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“…H(t j ) is the Heaviside function on the offset onset time. The parameters U, T and t are the event offset, the midpoint time of the modeled transient event, and the duration half width respectively, following the formulation of Larson et al [2004]. v i is the data residual noise.…”

Section: Geochemistry Geophysicsmentioning

confidence: 99%

Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Jiang

Wdowinski

Dixon

et al. 2012

Geochem Geophys Geosyst

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A network of continuously recording GPS stations has operated in the Nicoya Peninsula of northern Costa Rica since 2002. We processed all available data from this network for the period of 2002–2011 to investigate the occurrence of Slow Slip Events (SSE) on the subduction interface between the Cocos and Caribbean plates. In order to overcome signal masking by high levels of tropospheric noise, we developed a new technique that facilitates detection of transient events in the presence of noise. We identified five significant SSEs during the 2002–2011 period, with event middle times in 2003, 2005, 2007, 2009 and 2011, with an average recurrence interval of 21 ± 6 months. Time series analysis shows that transient deformation imparts a signature similar to random walk. Removal of the SSEs and regional common mode errors from the time series reduced velocity uncertainty by nearly an order of magnitude. Limited available data for the 2003, 2005 and 2011 events preclude detailed characterization of these events. However, good spatiotemporal coverage of the 2007 and 2009 events suggest that both events had irregular duration and distribution. In the 2007 event, slow slip started in the northwest coastal area and migrated southeastward over a period of ∼1 month. The 2009 event had a significantly longer event duration and larger surface displacement. Stations in the northwest area observed two separate SSEs in 2008.6 and 2009.4, correlating well with the tremor episodes offshore, indicating a shallow SSE slip patch with shorter recurrence interval. Significant differences between the 2009 and 2007 events lead us to question the simple recurrence interval model for the SSE in Nicoya.

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Section: Geochemistry Geophysicsmentioning

confidence: 99%

Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Jiang

Wdowinski

Dixon

et al. 2012

Geochem Geophys Geosyst

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“…A function used to fit the GPS coordinate time series and estimate the SQ displacements is of the form analogous to that in Larson et al (2004):…”

Section: Data Acquisition and Analysismentioning

confidence: 99%

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

et al. 2005

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The aseismic slow slip event of [2001][2002] in Guerrero, Mexico, with an equivalent magnitude M W ∼ 7.5, is the largest silent earthquake (SQ) among many recently recorded by GPS in different subduction zones (i.e. Japan, Alaska, Cascadia, New Zealand). The sub-horizontal and shallow plate interface in Central Mexico is responsible for specific conditions for the ∼100 km long extended transient zone where the SQs develop from ∼80 to ∼190 km inland from the trench. This wide transient zone and relatively large slow slips of 10 to 20 cm displacements on the subduction fault result in noticeable surface displacements of 5-6 cm during the SQs. Continuous GPS stations allow one to trace the propagation of SQs, and to estimate their arrival time, duration and geometric attenuation. These propagation parameters must be accounted in order to locate source of slow slips events and to understand the triggering effect that they have on large subduction earthquakes. We use longbaseline tiltmeter data to define new time limits This modeling shows that the SQ ceased gradually in the central part of the Oaxaca segment of the subduction zone (west of Puerto Angel, PUAN) and then it apparently triggered another SQ in SE Oaxaca (between PUAN and Salina Cruz, SACR). The estimated horizontal velocities for inter-event epochs at each GPS site are used to assess an average interplate coupling in the Central Oaxaca subduction zone.

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“…Unlike many SSEs previously observed at plate boundary subduction zones, such as southwestern Japan [Hirose et al, 1999], Cascadia on the western coast of the USA and Canada [Dragert et al, 2004], and Guerrero in southern Mexico [Larson et al, 2004], Montgomery-Brown et al [2013] reported that no associated tectonic tremor was detected during Kīlauea's SSEs, suggesting that these SSEs reflect somewhat distinct slip processes compared to those at plate boundary subduction zones.…”

Section: The Slow Slip Events At Kīlauea Hawaiimentioning

confidence: 73%

The 2010 slow slip event and secular motion at Kı̄lauea, Hawai‵i, inferred from TerraSAR‐X InSAR data

et al. 2014

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We present here a small baseline subset (SBAS) algorithm to extract both transient and secular ground deformations on the order of millimeters in the presence of tropospheric noise on the order of centimeters, when the transient is of short duration and known time and the background deformation is smooth in time. We applied this algorithm to study the 2010 slow slip event as well as the secular motion of Kı̄lauea's south flank using 49 TerraSAR‐X images. We also estimate the tropospheric delay variation relative to a given reference pixel using an interferometric synthetic aperture radar (InSAR) SBAS approach. We compare the InSAR SBAS solution for both ground deformation and tropospheric delays with existing GPS measurements and confirm that the ground deformation signal and tropospheric noise in InSAR data are successfully separated. We observe that the coastal region on the south side of the Hilina Pali moves at a higher background rate than the region north side of the Pali. We also conclude that the 2010 slow slip event (SSE) displacement is mainly horizontal and the maximum magnitude of the 2010 SSE vertical component is less than 5 mm.

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Crustal deformation measurements in Guerrero, Mexico

Cited by 98 publications

References 46 publications

Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

The 2010 slow slip event and secular motion at Kı̄lauea, Hawai‵i, inferred from TerraSAR‐X InSAR data

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