LiDAR-Assisted Identification of an Active Fault near Truckee, California

Hunter, Lewis E.; Howle, James F.; Rose, Ronn S.; Bawden, G. W.

doi:10.1785/0120090261

Cited by 45 publications

(29 citation statements)

References 40 publications

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“…Walker Lane [Faulds et al, 2005], in particular the recently identified Polaris fault zone extending north from near Truckee, California [Hunter et al, 2011]. This transition coincides with a northward decrease in the elevation of the Sierran range front associated with diminished normal faulting in the northern Walker Lane.…”

Section: Introductionmentioning

confidence: 80%

Evidence for Moho‐lower crustal transition depth diking and rifting of the Sierra Nevada microplate

Smith

Kent

Seggern

et al. 2016

Geophysical Research Letters

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Lithospheric rifting most often initiates in continental extensional settings where “breaking of a plate” may or may not progress to sea floor spreading. Generally, the strength of the lithosphere is greater than the tectonic forces required for rupture (i.e., the “tectonic force paradox”), and it has been proposed that rifting requires basaltic magmatism (e.g., dike emplacement) to reduce the strength and cause failure, except for the case of a thin lithosphere (<30 km thick). Here we isolate two very similar and unprecedented observations of Moho‐lower crustal transition dike or fluid injection earthquake swarms under southern Sierra Valley (SV: 2011–2012) and North Lake Tahoe (LT: 2003–2004), California. These planar distributions of seismicity can be interpreted to define the end points, and cover ~25% of the length, of an implied ~56 km long structure, each striking N45°W and dipping ~50°NE. A single event at ~30 km depth that locates on the implied dipping feature between the two swarms is further evidence for a single Moho‐transition depth structure. We propose that basaltic or fluid emplacement at or near Moho depths weakens the upper mantle lid, facilitating lithospheric rupture of the Sierra Microplate. Similar to the LT sequence, the SV event is also associated with increased upper crustal seismicity. An 27 October 2011, Mw 4.7 earthquake occurred directly above the deep SV sequence at the base of the upper crustal seismogenic zone (~15 km depth).

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Section: Introductionmentioning

confidence: 80%

Evidence for Moho‐lower crustal transition depth diking and rifting of the Sierra Nevada microplate

Smith

Kent

Seggern

et al. 2016

Geophysical Research Letters

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“…Due to its sub-meter resolution, LiDAR is one of the most useful remotely sensed datasets for the representation of landscape morphology and lithology, as well as for the identification and characterization of potentially active faults, since it has the potential to detect subtle tectonic signatures, especially in areas of dense vegetation (e.g. Arrowsmith & Zielke, 2009;Brunori, Civico, Cinti, & Ventura, 2013;Cunningham et al, 2006;Haugerud et al, 2003;Hilley, DeLong, Prentice, Blisniuk, & Arrowsmith, 2010;Hunter, Howle, Rose, & Bawden, 2011;Lin, Kaneda, Mukoyama, Asada, & Chiba, 2013). Vertical and horizontal errors associated with the available LiDAR acquisition are less than 0.2 m and 0.5 m, respectively.…”

Section: Methodsmentioning

confidence: 99%

Quaternary geology of the Middle Aterno Valley, 2009 L'Aquila earthquake area (Abruzzi Apennines, Italy)

et al. 2014

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We present a new 1:25,000-scale geological map of the Middle Aterno Valley basin, the epicenter of the 2009 L'Aquila M W 6.1 earthquake. This earthquake highlighted the incomplete understanding of the geology of the area, in particular the Quaternary continental deposits and active tectonics, which caused the Paganica fault system to be ignored by researchers.The map, utilizing airborne LiDAR analysis and traditional field survey approaches, is the first example in Italy (and one of the few in Europe) that integrates high-resolution topography in active tectonic studies. With unprecedented detail and precision on the spatial distribution of deposits, the map of the geomorphic and tectonic features provides new insight for the reconstruction of the Quaternary basin evolution and estimation of long-term deformation rates for the the Paganica fault system. Detailed fault mapping of Quaternary deposits represents an essential input for seismic hazard assessment and surface faulting hazard evaluation.

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“…The processed data will reveal the details of the bare earth, leading to topographic details in terms of relief, steepness, relation with drainage patterns, which may provide information about structural conditions in the form of overhangs where unconsolidated materials have collapsed to form irregular ridges, moletracks, alluvials fans, doglegs across drainage, aligned vegetation or geothermal springs. Such features may expose conditions favourable to land uplift in a localized zone as well as response to hillslope erosion (Hunter et al 2011). It is expected that mapping of the detailed surface geomorphology and inference of fine-scale structures and lineaments would in conjunction with the subsurface structure derived from drilling and other geophysical studies, help in understanding the stress field and seismo-tectonics of the region with respect to the reservoirs and their trigger effects on the seismicity in this region.…”

Section: Airborne Lidar Studiesmentioning

confidence: 99%

Investigations related to scientific deep drilling to study reservoir-triggered earthquakes at Koyna, India

Gupta

Rao

Roy

et al. 2014

Int J Earth Sci (Geol Rundsch)

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high-quality magnetotelluric data at 100 stations, provide both regional information about the thickness of the Deccan Traps and the occurrence of localized density heterogeneities and anomalous conductive zones in the vicinity of the hypocentral zone. Acquisition of airborne LiDAR data to obtain a high-resolution topographic model of the region has been completed over an area of 1,064 km 2 centred on the Koyna seismic zone. Seismometers have been deployed in the granitic basement inside two boreholes and are planned in another set of six boreholes to obtain accurate hypocentral locations and constrain the disposition of fault zones.

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LiDAR-Assisted Identification of an Active Fault near Truckee, California

Cited by 45 publications

References 40 publications

Evidence for Moho‐lower crustal transition depth diking and rifting of the Sierra Nevada microplate

Evidence for Moho‐lower crustal transition depth diking and rifting of the Sierra Nevada microplate

Quaternary geology of the Middle Aterno Valley, 2009 L'Aquila earthquake area (Abruzzi Apennines, Italy)

Investigations related to scientific deep drilling to study reservoir-triggered earthquakes at Koyna, India

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