60 k.y. record of extension across the western boundary of the Basin and Range province: Estimate of slip rates from offset shoreline terraces and a catastrophic slide beneath Lake Tahoe

Kent, G. M.; Babcock, J.; Driscoll, Neal W.; Harding, A. J.; Dingler, John R.; Seitz, Gordon G.; Gardner, James V.; Mayer, Larry A.; Goldman, Charles R.; Heyvaert, Alan C.; Richards, Robert C.; Karlin, Robert; Morgan, C.W.; Gayes, P. T.; Owen, Lewis A.

doi:10.1130/g21230.1

Cited by 53 publications

(62 citation statements)

References 12 publications

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“…This technique has been successfully applied to dating deformed sediments for palaeoseismic studies in the western USA (e.g. Machette et al 1992;Crone et al 1997;Rockwell et al 2000;Lee et al 2001;Kent et al 2005;Wesnousky et al 2005) and elsewhere in the world (e.g. Owen et al 1999;Washburn et al 2001).…”

Section: Vale Meão Winery Sitementioning

confidence: 99%

Palaeoseismology of the Vilariça Segment of the Manteigas-Bragança Fault in northeastern Portugal

Rockwell¹,

Fonseca

Madden³

et al. 2009

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The Manteigas-Bragança fault is a major, 250-km-long, NNE-striking, sinistral strike-slip structure in northern Portugal. This fault has no historical seismicity for large earthquakes, although it may have generated moderate (M5þ) earthquakes in 1751 and 1858. Evidence of continued left horizontal displacement is shown by the presence of Cenozoic pull-apart basins as well as late Quaternary stream deflections. To investigate its recent slip history, a number of trenches were excavated at three sites along the Vilariça segment, north and south of the Douro River. At one site at Vale Meão winery, the occurrence of at least two and probably three events in the past 14.5 ka was determined, suggesting an average return period of about 5-7 ka. All three events appear to have occurred as a cluster in the interval between 14.5 and 11 ka, or shortly thereafter, suggesting a return period of less than 2 ka between events within the cluster. In the same area, a small offset rill suggests 2 -2.5 m of slip in the most recent event and about 6.1 m after incision below a c. 16 ka alluvial fill event along the Douro River. At another site along the Vilariça River alluvial plain, NE of the Vale Meão site, several trenches were excavated in late Pleistocene and Holocene alluvium, and exposed the fault displacing channel deposits dated to between 18 and 23 ka. In a succession of closely spaced parallel cuts and trenches, the channel riser was traced into and across the fault to resolve c. 6.5 m of displacement after 18 ka and c. 9 m of slip after c. 23 ka. These observations yield a slip rate of 0.3-0.5 mm/a, which is consistent with earlier estimates. Combining the information on timing at Vale Meão winery and displacement at Vilariça argues for earthquakes in the M7þ range, with coseismic displacements of 2 -3 m. This demonstrates that there are potential seismic sources in Portugal that are not associated with the 1755 Lisbon earthquake or the Tagus Valley, and, although rare, large events on the Vilariça fault could be quite destructive for the region. This work provides an analogue for the study of active faulting in intracontinental settings and supports the view that earthquakes within intracontinental settings tend to cluster in time. In addition, this study highlights the usefulness and application of multiple field, remote sensing and geochronological techniques for seismic hazard mitigation.

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Section: Vale Meão Winery Sitementioning

confidence: 99%

Palaeoseismology of the Vilariça Segment of the Manteigas-Bragança Fault in northeastern Portugal

Rockwell¹,

Fonseca

Madden³

et al. 2009

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“…The time span represented by these records is variable, but frequently surpasses 10 000 yr. Lacustrine turbidite palaeoseismology has been used to reconstruct earthquake chronologies around the world, including Switzerland (Schnellman et al, 2002;Arnaud et al, 2006;Strasser et al, 2006), Chile, (Arnaud et al, 2006;Moernaut et al, 2007;Bertrand et al, 2008;Charlet et al, 2008), Argentina (Waldmann et al, 2008), Venezuela (Carrillo et al, 2008), France (Chapron et al, 1999;Arnaud et al, 2002;Guyard et al, 2007;Beck, 2009), Kyrghyzstan (Bowman et al, 2004), Japan, (Shiki et al, 2000a), Russia (Nelson et al, 1995), Canada (Doig, 1986(Doig, , 1990(Doig, , 1991, New Zealand (Orpin et al, 2010;Howarth et al, 2012), California (Smoot et al, 2000;Seitz and Kent, 2005;Kent et al, 2005;Brothers et al, 2009), Arizona (Twitchell et al, 2005), as well as in the vicinity of the CSZ at Lake Washington, USA (Karlin et al, 2004;Abella, 1992, 1996). In favourable settings, reconstructions can reach 50 000 yr (late-Pleistocene Lake Lisan, palaeo-Dead Sea; Marco et al, 1996).…”

Section: A E Morey Et Al: Do Small Lakes Record Cascadia Earthquakes?mentioning

confidence: 99%

Are great Cascadia earthquakes recorded in the sedimentary records from small forearc lakes?

Morey

Goldfinger

Briles

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Abstract. Here we investigate sedimentary records from four small inland lakes located in the southern Cascadia forearc region for evidence of earthquakes. Three of these lakes are in the Klamath Mountains near the Oregon-California border, and one is in the central Oregon Coast range. The sedimentary sequences recovered from these lakes are composed of normal lake sediment interbedded with disturbance event layers. The thickest of these layers are graded, and appear to be turbidites or linked debrites (turbidites with a basal debris-flow deposit), suggesting rapid deposition. Variations in particle size and organic content of these layers are reflected in the density and magnetic susceptibility data. The frequency and timing of these events, based on radiocarbon ages from detrital organics, is similar to the offshore seismogenic turbidite record from trench and slope basin cores along the Cascadia margin. Stratigraphic correlation of these anomalous deposits based on radiocarbon ages, down-core density, and magnetic susceptibility data between lake and offshore records suggest synchronous triggering. The areal extent and multiple depositional environments over which these events appear to correlate suggest that these deposits were most likely caused by shaking during great Cascadia earthquakes.

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“…In the WGCEP 2007 fault section database, each section is associated with a set of geometrical and kinematic parameters: (1) section name, (2) fault trace, (3) average (2000), and the West Tahoe fault has been added based on the work of Kent et al (2005).…”

Section: Fault Section Databasementioning

confidence: 99%

Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2)

Field

Dawson

Felzer

et al. 2009

Bulletin of the Seismological Society of America

269

183

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The 2007 Working Group on California Earthquake Probabilities (WGCEP, 2007) presents the Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2). This model comprises a time-independent (Poisson-process) earthquake rate model, developed jointly with the National Seismic Hazard Mapping Program and a time-dependent earthquake-probability model, based on recent earthquake rates and stress-renewal statistics conditioned on the date of last event. The models were developed from updated statewide earthquake catalogs and fault deformation databases using a uniform methodology across all regions and implemented in the modular, extensible Open Seismic Hazard Analysis framework. The rate model satisfies integrating measures of deformation across the plate-boundary zone and is consistent with historical seismicity data. An overprediction of earthquake rates found at intermediate magnitudes (6:5 ≤ M ≤ 7:0) in previous models has been reduced to within the 95% confidence bounds of the historical earthquake catalog. A logic tree with 480 branches represents the epistemic uncertainties of the full time-dependent model. The mean UCERF 2 time-dependent probability of one or more M ≥ 6:7 earthquakes in the California region during the next 30 yr is 99.7%; this probability decreases to 46% for M ≥ 7:5 and to 4.5% for M ≥ 8:0. These probabilities do not include the Cascadia subduction zone, largely north of California, for which the estimated 30 yr, M ≥ 8:0 time-dependent probability is 10%. The M ≥ 6:7 probabilities on major strike-slip faults are consistent with the WGCEP (2003) study in the San Francisco Bay Area and the WGCEP (1995) study in southern California, except for significantly lower estimates along the San Jacinto and Elsinore faults, owing to provisions for larger multisegment ruptures. Important model limitations are discussed.

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60 k.y. record of extension across the western boundary of the Basin and Range province: Estimate of slip rates from offset shoreline terraces and a catastrophic slide beneath Lake Tahoe

Cited by 53 publications

References 12 publications

Palaeoseismology of the Vilariça Segment of the Manteigas-Bragança Fault in northeastern Portugal

Palaeoseismology of the Vilariça Segment of the Manteigas-Bragança Fault in northeastern Portugal

Are great Cascadia earthquakes recorded in the sedimentary records from small forearc lakes?

Uniform California Earthquake Rupture Forecast, Version 2 (UCERF 2)

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