August 2018
July 2018
Tidal Modulation and Tectonic Implications of Tremors in Taiwan
- Pages: 5945-5964 First Published:05 July 2018
- We present results from 6 years of tremor observations in a continental subduction zone
- Tremor occurrence is strongly modulated by fluctuations in both shear and normal stress (tensile)
- We propose a tectonic model that can be reconciled with both the steeply and gently dipping geometry of the tremor zone
- Pages: 6769-6783 First Published:27 July 2018
- Offshore tectonic tremor localizes at subducted seamounts during and immediately following the 2014 Gisborne SSE
- Stresses from seamount subduction dominate megathrust slow slip in producing seismicity and tremor
- A wide range of slip processes occur on the plate interface in very close proximity to one another
- Pages: 7090-7107 First Published:31 July 2018
- Spatiotemporal evolutions are described for five slow slip events (SSEs) with Mw 6.6–6.7 in the southern Ryukyu subduction zone
- The final slip distributions of the five SSEs are similar, indicating that the SSEs recur in the same fault area
- The temporal evolution of the five SSEs, especially the nucleation styles, varies from event to event
- Pages: 7126-7150 First Published:16 July 2018
- We build GPS‐based models of strain accumulation on faults beneath Los Angeles that incorporate the effect of the sedimentary basin
- We infer that three major thrust faults slip at 3‐4 mm/year over the long term and are partially or fully locked on their upper sections
- This locking corresponds to a total seismic moment deficit rate of 1.6 + 1.3/‐0.5 times 1017Nm/year, which is presumably released in earthquakes
June 2018
Crustal Deformation Following Great Subduction Earthquakes Controlled by Earthquake Size and Mantle Rheology
- Pages: 5323-5345 First Published:09 June 2018
- In postseismic deformation following great subduction earthquakes, the dividing boundary of opposing motion migrates away from the trench
- How fast the dividing boundary migrates, measured using a reference time, depends on Earth's viscoelastic rheology and earthquake size
- Comparative modeling of ten 8.0 ≤ Mw ≤ 9.5 earthquakes suggests a positive dependence of the reference time on earthquake size
- Pages: 6072-6085 First Published:26 June 2018
- Decomposition of geodetic strain rate pattern with respect to its wavelength is performed
- Localized contraction with changes in amplitude and location is found before and after the Tohoku‐oki earthquake
- Effects of inelastic process, as well as elastic heterogeneities within the crust, are embedded with the geodetic signal
- Pages: 6086-6097 First Published:26 June 2018
- Two characteristic length scales occur in the tectonic deformation of the western United States
- These scales suggest that the North American lithosphere includes at least two distinct rheological materials
- Spectral tools can be used to evaluate characteristic scaling and hence provide novel constraints on continental rheology and architecture
May 2018
- Pages: 5265-5278 First Published:04 June 2018
- The limit of fault coupling on the Main Himalayan Thrust agrees with geologic models of the midcrustal ramp in central and eastern Nepal
- In western Nepal, the fault coupling transition falls between two proposed ramp locations, and we suggest that both may be active
- The moment accumulation rate in our model is 30% smaller than previous results, partially resolving an apparent seismic moment deficit
- Pages: 5300-5322 First Published:06 May 2018
- Horizontal cGPS displacements show dilatational strain and Coulomb stress change in South Napa peaking just before the 2014 earthquake
- Eight years of cGPS data show broad seasonally repeating strain and stress transients East and North of San Pablo Bay
- Some component of the transient strains may be associated with hydrologic and thermoelastic sources
- Pages: 5018-5051 First Published:17 May 2018
- We present an invariant rate‐ and state‐dependent friction formulation for simulations in a continuum mechanics framework
- Numerical accuracy and stability is demonstrated for seismic slip on a straight fault
- Based on our simulations, we derive a viscosity threshold, below which no earthquakes are generated
April 2018
- Pages: 4388-4412 First Published:05 May 2018
- A new strain rate model and vertical velocity map for intraplate North America are derived from up to 3,271 GPS velocities
- Results reflect GIA with contractional strain rates and far‐field horizontal velocities being significantly higher than predicted
- Nonrigidity of the North American plate has implications for plate motion estimation, reference frame, and Earth viscosity structure
- Pages: 4223-4242 First Published:30 March 2018
- Pacific‐North America plate boundary is located on the ocean‐continent boundary, an unusual location for continental transforms
- The bimaterial contrast across the plate boundary focuses the deformation on a single narrow fault
- A scenario for the development of the plate boundary is proposed
- Pages: 4041-4062 First Published:22 April 2018
- Earthquake clustering responds differently to hydraulic operations at The Geysers, Coso, and Salton Sea geothermal fields
- The variations of the response are likely related to different local tectonic processes and structures
- Background earthquake rates and types of clusters change between periods of low and high injection‐production fluid balance
- Pages: 4171-4192 First Published:25 March 2018
- GPS rates south of 21°S accelerate in the second year following the Iquique‐Pisagua event potentially reflecting coupling increase
- Afterslip lasts about 2 years before the interface relocks again almost entirely
- GPS velocity patterns and modeled interface afterslip rates suggest a seismotectonic barrier at 21°S
- Pages: 4243-4265 First Published:06 April 2018
- We estimate the moment rate power spectrum of slow slip events in Cascadia using GPS, strain, and tremor data
- We obtain a moment rate spectrum with shallow power law frequency decay at periods shorter than 1 day
- The spectrum can be reproduced if large slow slip events contain collections of subevents with linear moment‐duration scaling
March 2018
Journal of Geophysical Research: Solid Earth
First published: 30 March 2018
Journal of Geophysical Research: Solid Earth
First published: 25 March 2018
Journal of Geophysical Research: Solid Earth
First published: 25 March 2018
Journal of Geophysical Research: Solid Earth
First published: 10 March 2018
February 2018
First published: 02 February 2018
Journal of Geophysical Research: Solid EarthVolume 123, Issue 2
First published: 09 February 2018
Journal of Geophysical Research: Solid Earth
First published: 21 February 2018
Spatiotemporal Variations in Slow Earthquakes Along the Mexican Subduction Zone
J. Maury S. Ide V. M. Cruz‐Atienza V. Kostoglodov
Journal of Geophysical Research: Solid EarthVolume 123, Issue 2
First published: 19 January 2018
Journal of Geophysical Research: Solid EarthVolume 123, Issue 2
First published: 05 December 2017
January 2018
Authors: Ian Stone, John E. Vidale, Shuoshuo Han, Emily Roland
First Published: 29 January 2018
- We develop an earthquake catalog using the Cascadia Initiative ocean bottom seismometer data set for the entire Cascadia subduction zone
- Subduction zone and Juan de Fuca plate seismicity increases from north to south, with distinct increase in seismicity south of 46°N
- Seismicity varies with incoming plate smoothness and hydration, tied to observed trends in intraplate deformation and underthrust sediment
Authors: Ekaterina Tymofyeyeva, Yuri Fialko
First Published: 27 January 2018
- We combine InSAR and GPS data to derive maps of three‐component interseismic surface velocity and strain rate
- Strain rate anomaly at the southern end of the San Jacinto fault lends support to a hypothesized blind fault segment
- Slip rate on a blind fault segment is 13 plus‐minus 3 mm/yr, higher than on the nearby Coyote Creek fault
Authors: A. M. Thomas, N. M. Beeler, Q. Bletery, R. Burgmann, D. R. Shelly
First Published: 22 January 2018
- We define slip episodes, or clusters of individual LFE occurrence, based on properties of LFE recurrence intervals
- We formalize the definition of a creepmeter and determine its applicability to LFE families on the deep San Andreas Fault
- We find that episodic families meter creep and reflect surrounding SSEs, while continuous families reflect asperities that fail in response to continuous creep
Authors: Haotian Li, Meng Wei, Duo Li, Yajing Liu, YoungHee Kim, Shiyong Zhou
First Published: 15 January 2018
- We simulate SSEs in south central Alaska with a nonplanar fault model
- Along‐strike variation of effective normal stress controls the segmentation of SSEs
- The segmentation is likely related to the subducted Yakutat Plateau
Authors: William C. Hammond, Reed J. Burgette, Kaj M. Johnson, Geoffrey Blewitt
First Published: 15 January 2018
- We estimate the uplift rate of the Western Transverse Ranges in southern California from integrated GPS, InSAR, leveling, and tide gauge data
- Geodetic imaging of topographic growth reveals the vertical response to contraction across the Big Bend of the San Andreas Fault system
- Geographically continuous uplift of 1–2 mm/yr is asymmetric across the San Andreas Fault and decreases to subsidence near the coast
Authors: Kang Wang, Yuri Fialko
First Published: 10 January 2018
- We developed FEM of the 2015 Gorkha earthquake that accounts for variations in topography and material properties across the Himalayan arc
- Space geodetic observations reveal transient deformation following the Gorkha earthquake that is best explained by downdip afterslip
- Observed deformation is inconsistent with models of a low‐viscosity (order of 1018 Pa s or less) channel in the lower crust beneath Tibet
Authors: Jun'ichi Fukuda
First Published: 10 January 2018
- Five Boso slow slip events (SSEs) exhibit variable nucleation style and space‐time evolution of slip
- Overall evolution of the SSEs and relative timing between onsets of slow slip and accompanying seismicity correlate with nucleation style
- Slip expansion/propagation patterns vary among the SSEs and correlate well with the space‐time migration of seismicity
December 2017
Authors: Donald F. Argus, Felix W. Landerer, David N. Wiese, Hilary R. Martens, Yuning Fu, James S. Famiglietti, Brian F. Thomas, Thomas G. Farr, Angelyn W. Moore, Michael M. Watkins
First Published: 26 December 2017
- Elastic vertical displacements are inverted to infer change in total water storage in mountain ranges in the western U.S. from 2006 to 2017
- Sierra Nevada uplift during severe drought from 2012 to 2015 is primarily solid Earth's elastic response to water loss in the Sierra Nevada
- More water in the ground in California's mountains is lost during drought and gained during heavy precipitation than in hydrology models
Authors: Christopher W. Johnson, Yuning Fu, Roland Bürgmann
First Published: 26 December 2017
- Mechanical models are developed to quantify stress changes for the regional fault geometry induced by seven sources of annual loading
- Annual hydrospheric loading in California produces the largest Coulomb stress changes of 0.5–2 kPa on regional fault systems
- Annual stress changes of ≤5 kPa in the principal orientation of the background stress field modulate low‐magnitude seismicity
Authors: C. Kyriakopoulos, D. D. Oglesby, G. J. Funning, Kenny J. Ryan
First Published: 19 December 2017
- Similar slip pattern between dynamic rupture model and geodetic model
- First‐order geometric effects on fault slip distribution
- Topographic effects on fault slip rates
Authors: B. Rousset, M. Campillo, C. Lasserre, W. B. Frank, N. Cotte, A. Walpersdorf, A. Socquet, V. Kostoglodov
First Published: 18 December 2017
- We developed a geodetic matched filter that specifically allows for the search of low‐amplitude slow slip events
- Synthetic tests show that this method is able to resolve Mw> 6 events in the context of the Mexico subduction zone
- The application on real data between 2005 and 2014 enables to detect 28 slow slip events of Mw between 6.3 and 7.2 in the Guerrero area
Authors: Luisa Valoroso, Lauro Chiaraluce, Raffaele Di Stefano, Giancarlo Monachesi
First Published: 18 December 2017
- High‐resolution locations describe the anatomy of the Altotiberina low‐angle normal fault and of its complex synthetic and antithetic splays
- The spatiotemporal seismicity distribution agrees with the geodetic models reporting a frictionally heterogeneous low‐angle ATF plane
- The rate of occurrence of repeating events along the ATF seems to modulate the seismicity in its hanging wall block
Authors: Kazuaki Ohta, Satoshi Ide
First Published: 4 December 2017
- We propose a new slip inversion method for resolving the detailed slip evolution of deep tremor
- Slip distributions of deep tremor illuminate the patchy source regions of slow earthquakes in western and central Shikoku, Japan
- The size of the slip region may potentially control the visibility of very low frequency earthquake signals
November 2017
Authors: E. A. Ainscoe, J. R. Elliott, A. Copley, T. J. Craig, T. Li, B. E. Parsons, R. T. Walker
First Published: 27 November 2017
- Coseismic fault geometry and location closely match a preexisting blind fault
- Quaternary fold grows by distributed deformation in the overlying sediments and does not align with coseismic or early postseismic uplift
- Rheology contrast between the Tarim Basin and Tibet may explain the earthquake's low dip angle
Authors: Rino Salman, Emma M. Hill, Lujia Feng, Eric O. Lindsey, Deepa Mele Veedu, Sylvain Barbot, Paramesh Banerjee, Iwan Hermawan, Danny H. Natawidjaja
First Published: 27 November 2017
- We present the first detailed study of the 2008 Mw 7.2 North Pagai earthquake using GPS and InSAR data
- The 2008 earthquake sequence ruptured only partially the middle section of the Mentawai patch
- The estimated afterslip partially overlaps the updip region of the coseismic rupture area
Authors: Han Yue, Zachary E. Ross, Cunren Liang, Sylvain Michel, Heresh Fattahi, Eric Fielding, Angelyn Moore, Zhen Liu, Bo Jia
First Published: 27 November 2017
- Detailed slip model of Kumamoto earthquake sequence resolved
- Innovative model parameterization adopted in inversion
- Effects of “material” and “stress” barriers classified and discussed
Authors: Lavinia Tunini, Ivone Jiménez‐Munt, Manel Fernandez, Jaume Vergés, Peter Bird
First Published: 27 November 2017
- Modeled velocities reproduce lateral escape tectonics due to the continental collisions of Arabia and India with Eurasia
- SE Tibet velocities can be explained by the combination of Sumatra trench retreat, a lithospheric mantle thinning and strike‐slip faulting
- Arabia‐India intercollision zone shows no velocity deflections related to Arabia and India indentations
Authors: Emily Warren‐Smith, Simon Lamb, Tim A. Stern, Euan Smith
First Published: 27 November 2017
- We present a detailed 15 month microseismicity catalog for the Southern Lakes region, New Zealand, adjacent to the Alpine Fault
- Microseismicity shows little association with known faults, representing diffuse background cracking in response to ambient stress release
- Total moment release rate is ~0.1% of the total plate convergence rate; the rest is likely released in large‐great magnitude earthquakes
Authors: Gang Zheng, Hua Wang, Tim J. Wright, Yidong Lou, Rui Zhang, Weixing Zhang, Chuang Shi, Jinfang Huang, Na Wei
First Published: 6 November 2017
- The most complete and up‐to‐date velocity field in the India‐Eurasia collision zone including 2576 GPS stations observed from 1991 to 2015
- Velocity field shows several large undeforming areas, strain around some major faults, areas of diffuse strain, and dilation of high plateau
- There was no robust evidence for discrepancy between geological and geodetic slip rates of the major strike‐slip faults in Tibet
Authors: Tim W. Hayward, Michael G. Bostock
First Published: 3 November 2017
- Repeating earthquakes were observed at the Queen Charlotte plate boundary
- Short‐term acceleration of the Queen Charlotte Fault detected following the 2012 Haida Gwaii earthquake
- Prolonged afterslip detected on the subduction interface following the 2012 Haida Gwaii earthquake
October 2017
Authors: Phillip K. McFarland, Richard A. Bennett, Patricia Alvarado, Peter G. DeCelles
First Published: 28 October 2017
- Interseismic velocity field presented for southern central Andean back arc including five new stations from the Puna‐Andes GPS Array
- Deformation due to locking on both subduction interface and back‐arc décollement required to fit observed GPS velocities across orogen at 24°S
- Best fit to GPS velocities with ~9 mm/yr of hanging wall shortening in the back‐arc fold‐thrust belt, with shortening concentrated beneath the Eastern Cordillera
Authors: Estelle Chaussard, Pietro Milillo, Roland Bürgmann, Daniele Perissin, Eric J. Fielding, Brett Baker
First Published: 26 October 2017
- InSAR time series of high‐repeatability data enable tracking water through an aquifer system and evaluate water‐resource management practices
- In the Santa Clara Valley (SCV), CA, the 2012–2015 drought led to only elastic and recoverable changes thanks to management efforts
- Surface load changes due to groundwater mass changes in an aquifer system could influence the stress on nearby faults
Authors: Bin Zhao, Roland Bürgmann, Dongzhen Wang, Kai Tan, Ruilin Du, Rui Zhang
First Published: 14 October 2017
- Postseismic displacements in initial 1 year following the Gorkha earthquake are governed by afterslip and viscoelastic relaxation
- Stress‐driven downdip afterslip occurs predominately in brittle‐ductile transition
- Viscoelastic relaxation models suggest laterally heterogeneous rheological structure across India and Tibet
Authors: Kayla A. Kroll, Keith B. Richards‐Dinger, James H. Dieterich, Elizabeth S. Cochran
First Published: 14 October 2017
- Seismic quiescence and triggering is observed related to coseismic static stress changes
- Decreased seismicity rates may be obscured by a small subset events with positive CFS
- Coupled Coulomb/rate‐state models can explain time‐dependent delay in seismicity rate decreases due to negative coseismic stress changes
Authors: Andreas P. Mavrommatis, Paul Segall, Kaj M. Johnson
First Published: 7 October 2017
- A physical model for locked fault asperities that shrink during the interseismic period is developed
- Numerical simulations of rate‐and‐state friction with thermal pressurization show that locked area shrinks roughly linearly over time
- We investigate the rate of asperity erosion as a function of fault strength, hydraulic properties, and asperity size
Authors: Dominic Evanzia, Thomas Wilson, Martha K. Savage, Simon Lamb, Hamish Hirschberg
First Published: 7 October 2017
- Focal mechanism inversion and S wave anisotropy were used to measure the stress field orientation in the southern North Island New Zealand
- At the southern Hikurangi margin the stress field within the subducting slab is dominated by bending stresses
- The overriding plate stress field is influenced by stresses in the subducting slab, gravitational stresses, and tectonic loading
September 2017
Authors: Bryan J. Stressler, William D. Barnhart
First Published: 25 September 2017
- We investigate the resolution of Coulomb stress change predictions in subduction zone environments
- The accuracy of stress change predictions is highly limited by model resolution and terrestrial geodetic arrays
- Seafloor geodetic observations provide one possible avenue to improve models of static stress transfer following offshore earthquakes
August 2017
Carlos Villafuerte, Víctor M. Cruz‐Atienza
First Published: 26 August 2017
- The SSE slip rate modulates the TT and LFE occurrence rate in the whole tremor region of Guerrero
- The strength of the tremor asperities is 2.3 times smaller downdip in the sweet spot than updip in the transient zone
- The short‐term SSEs take place right in the sweet spot, where tremor activity dominates during the interlong‐term SSE period
Jeremy Maurer, Paul Segall, Andrew M. Bradley
First Published: 19 August 2017
- The geodetic moment deficit rate (MDR) measures earthquake potential without smoothness assumptions
- Two proposed methods based on constrained optimization provide reliable bounds on MDR; other methods can fail
- The estimated MDR at Parkfield excludes the observed 38 year recurrence time between 1966 and 2004 events
Junle Jiang, Nadia Lapusta
First Published: 15 August 2017
- The deeper locked‐creeping fault transition can span a broad depth range, with distinct effective and geodetic locking depths
- The effective locking depth becomes shallower with time and relates to microseismicity at the bottom of the seismogenic zone
- The geodetic locking depth becomes deeper with time and relates to the potency release and depth extent of large earthquakes
Fred F. Pollitz, Camilla Cattania
First Published: 14 August 2017
- A catalog spanning three decades of Southern California seismicity is consistent with the Coulomb rate‐state stressing model
- Spatial patterns of seismicity evolved systematically following the 1992 Landers, California, earthquake
- Both static and viscoelastic stress transfer mechanisms are effective at triggering seismicity
Nicholas K. Voss, Rocco Malservisi, Timothy H. Dixon, Marino Protti
First Published: 9 August 2017
- Slow Slip Event recurrence rate was unaffected by large earthquake on same megathrust segment
- Deep and shallow zones of SSE behaved differently following the earthquake
- Change in slip magnitudes for SSE show variability in strain release through SSE during the earthquake cycle
Pathikrit Bhattacharya, Allan M. Rubin, Nicholas M. Beeler
First Published: 10 August 2017
- We fit a sequence of slide‐hold‐slides spanning 0.4–30,000 s performed at two different stiffnesses on initially bare granite and quartzite
- Stiffness‐independent evolution of peak stress with hold time, long identified with time‐dependent healing, can also be fit by the Slip law
- Stiffness‐dependent rates of stress decay during long holds are well fit by Slip law but contradict Aging law type time‐dependent healing
Tianyi Li, Allan M. Rubin
First Published: 10 August 2017
- We model friction evolution by keeping track of the heterogeneous strength of individual asperity contacts with an assumed size distribution
- If the strength of an asperity segment depends logarithmically on the velocity at which it formed, state evolution can mimic the slip law
- Equating “state” with “contact age” gives rise to state evolution that differs from the current aging law
July 2017
Shyam Nandan, Guy Ouillon, Stefan Wiemer, Didier Sornette
First Published: 3 July 2017; Vol: 122, 10.1002/2016JB013266
- Efficient data‐driven method for estimation of spatially variable ETAS parameters
- Evidence for existence of triggering possibly through fluid‐induced activation
- Evidence for seismic coupling independent of hypocentral depth
Norishige Hatakeyama, Naoki Uchida, Toru Matsuzawa, Wataru Nakamura
First Published: 5 July 2017; Vol: 122, DOI: 10.1002/2016JB013914
- We investigated temporal changes in interplate seismicity due to the 2011 Tohoku‐oki earthquake in a fault‐creep dominant area
- We observed coseismic emergence and subsequent disappearance of interplate earthquakes including repeating earthquakes
- The observations can be explained by slip behavior transition between seismic and aseismic depending on the loading rate
Kevin Chao, Zhigang Peng, Ya‐Ju Hsu, Kazushige Obara, Chunquan Wu, Kuo‐En Ching, Suzan van der Lee, Hsin‐Chieh Pu, Peih‐Lin Leu, Aaron Wech
First Published: 22 July 2017; Vol: 122, DOI: 10.1002/2016JB013925
- A robust automatic tremor detection and location algorithm for the southern Central Range of Taiwan
- Observations of a short‐term increase in the tremor rate starting at 19 days before a nearby ML6.4 earthquake
- No GPS signals associated with tremor activity in the southern Central Range
Maomao Wang, Aiming Lin
First Published: 11 July 2017; Vol: 122, DOI: 10.1002/2016JB013391
- We show 3‐D model of segmented active thrust slip fault system for the Longquan fault
- Field observation and trench study reveal that two surface rupture events occurred at the frontal, shallow portions of the Longmen Shan fold‐and‐thrust belt
- Shallow detachment and active frontal thrust should be included in a comprehensive analysis of seismic cycles of active fold‐and‐thrust belt systems