scholarly journals Tectonic implications of a dense continuous GPS velocity field at Yucca Mountain, Nevada

2004 ◽  
Vol 109 (B12) ◽  
Author(s):  
Brian Wernicke
Keyword(s):  
Velocity Field ◽  
Yucca Mountain ◽  
Tectonic Implications ◽  
Continuous Gps ◽  
Gps Velocity Field

scholarly journals The interseismic velocity field of the central Apennines from a dense GPS network

2013 ◽  
Vol 55 (5) ◽  
Author(s):  
Alessandro Galvani ◽  
Marco Anzidei ◽  
Roberto Devoti ◽  
Alessandra Esposito ◽  
Grazia Pietrantonio ◽  
...  
Keyword(s):  
Velocity Field ◽  
Geodetic Network ◽  
Central Apennines ◽  
Position Time Series ◽  
Seismogenic Structures ◽  
Adriatic Coast ◽  
Continuous Gps ◽  
Interseismic Velocity ◽  
Strain Rate Field ◽  
Gps Velocity Field

<p>Since 1999, we have repeatedly surveyed the central Apennines through a dense survey-style geodetic network, the Central Apennines Geodetic Network (CAGeoNet). CAGeoNet consists of 123 benchmarks distributed over an area of ca. 180 km × 130 km, from the Tyrrhenian coast to the Adriatic coast, with an average inter-site distance of 3 km to 5 km. The network is positioned across the main seismogenic structures of the region that are capable of generating destructive earthquakes. Here, we show the horizontal GPS velocity field of both CAGeoNet and continuous GPS stations in this region, as estimated from the position–time series in the time span from 1999 to 2007. We analyzed the data using both the Bernese and GAMIT software, rigorously combining the two solutions to obtain a validated result. Then, we analyzed the strain-rate field, which shows a region of extension along the axis of the Apennine chain, with values from 2 × 10<span><sup>–9</sup></span> yr<span><sup>–1</sup></span> to 66·× 10<span><sup>–9</sup></span> yr<span><sup>–1</sup></span>, and a relative minimum of ca. 20 × 10<span><sup>–9</sup></span> yr<span><sup>–1</sup></span> located in the L'Aquila basin area. Our velocity field represents an improved estimation of the ongoing elastic interseismic deformation of the central Apennines, and in particular relating to the area of the L'Aquila earthquake of April 6, 2009.</p>

scholarly journals New geodetic constraints on southern San Andreas fault-slip rates, San Gorgonio Pass, California

Geosphere ◽  
2020 ◽  
Author(s):  
Katherine A. Guns ◽  
Richard A Bennett ◽  
Joshua C. Spinler ◽  
Sally F. McGill
Keyword(s):  
Velocity Field ◽  
Southern California ◽  
San Andreas Fault ◽  
Plate Boundary ◽  
Slip Rate ◽  
Fault Slip ◽  
Slip Rates ◽  
San Andreas ◽  
Fault Slip Rates ◽  
Gps Velocity Field

Assessing fault-slip rates in diffuse plate boundary systems such as the San Andreas fault in southern California is critical both to characterize seis­mic hazards and to understand how different fault strands work together to accommodate plate boundary motion. In places such as San Gorgonio Pass, the geometric complexity of numerous fault strands interacting in a small area adds an extra obstacle to understanding the rupture potential and behavior of each individual fault. To better understand partitioning of fault-slip rates in this region, we build a new set of elastic fault-block models that test 16 different model fault geometries for the area. These models build on previ­ous studies by incorporating updated campaign GPS measurements from the San Bernardino Mountains and Eastern Transverse Ranges into a newly calculated GPS velocity field that has been removed of long- and short-term postseismic displacements from 12 past large-magnitude earthquakes to estimate model fault-slip rates. Using this postseismic-reduced GPS velocity field produces a best- fitting model geometry that resolves the long-standing geologic-geodetic slip-rate discrepancy in the Eastern California shear zone when off-fault deformation is taken into account, yielding a summed slip rate of 7.2 ± 2.8 mm/yr. Our models indicate that two active strands of the San Andreas system in San Gorgonio Pass are needed to produce sufficiently low geodetic dextral slip rates to match geologic observations. Lastly, results suggest that postseismic deformation may have more of a role to play in affecting the loading of faults in southern California than previously thought.

scholarly journals A GPS velocity field for Fennoscandia and a consistent comparison to glacial isostatic adjustment models

2014 ◽  
Vol 119 (8) ◽  
pp. 6613-6629 ◽  
Author(s):  
Halfdan Pascal Kierulf ◽  
Holger Steffen ◽  
Matthew James Ross Simpson ◽  
Martin Lidberg ◽  
Patrick Wu ◽  
...  
Keyword(s):  
Velocity Field ◽  
Glacial Isostatic Adjustment ◽  
Isostatic Adjustment ◽  
Gps Velocity Field

scholarly journals GPS velocity field for the Tien Shan and surrounding regions

Tectonics ◽  
2010 ◽  
Vol 29 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Alexander V. Zubovich ◽  
Xiao-qiang Wang ◽  
Yuri G. Scherba ◽  
Gennady G. Schelochkov ◽  
Robert Reilinger ◽  
...  
Keyword(s):  
Velocity Field ◽  
Tien Shan ◽  
Gps Velocity Field

scholarly journals 3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees

Solid Earth ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 1349-1363 ◽  
Author(s):  
Hai Ninh Nguyen ◽  
Philippe Vernant ◽  
Stephane Mazzotti ◽  
Giorgi Khazaradze ◽  
Eva Asensio
Keyword(s):  
Time Series ◽  
Velocity Field ◽  
Large Scale ◽  
Processing Parameters ◽  
Western Alps ◽  
Southern France ◽  
Ice Cap ◽  
Uplift Rates ◽  
Horizontal Strain ◽  
Gps Velocity Field

Abstract. We present a new 3-D GPS velocity solution for 182 sites for the region encompassing the Western Alps, Pyrenees, and southern France. The velocity field is based on a Precise Point Positioning (PPP) solution, to which we apply a common-mode filter, defined by the 26 longest time series, in order to correct for network-wide biases (reference frame, unmodeled large-scale processes, etc.). We show that processing parameters, such as troposphere delay modeling, can lead to systematic velocity variations of 0.1–0.5 mm yr−1 affecting both accuracy and precision, especially for short (< 5 years) time series. A velocity convergence analysis shows that minimum time-series lengths of  ∼  3 and  ∼  5.5 years are required to reach a velocity stability of 0.5 mm yr−1 in the horizontal and vertical components, respectively. On average, horizontal residual velocities show a stability of  ∼  0.2 mm yr−1 in the Western Alps, Pyrenees, and southern France. The only significant horizontal strain rate signal is in the western Pyrenees with up to 4  ×  10−9 yr−1 NNE–SSW extension, whereas no significant strain rates are detected in the Western Alps (< 1  ×  10−9 yr−1). In contrast, we identify significant uplift rates up to 2 mm yr−1 in the Western Alps but not in the Pyrenees (0.1 ± 0.2 mm yr−1). A correlation between site elevations and fast uplift rates in the northern part of the Western Alps, in the region of the Würmian ice cap, suggests that part of this uplift is induced by postglacial rebound. The very slow uplift rates in the southern Western Alps and in the Pyrenees could be accounted for by erosion-induced rebound.

Sign in / Sign up

Export Citation Format

Share Document