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Pinon Flat Observatory

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Journal Article
Published: 24 May 2017
Seismological Research Letters (2017) 88 (4): 1107–1116.
...Stefanie Donner; Chin‐Jen Lin; Céline Hadziioannou; André Gebauer; Frank Vernon; Duncan Carr Agnew; Heiner Igel; Ulrich Schreiber; Joachim Wassermann ABSTRACT The unique instrument setting at the Piñon Flat Observatory in California is used to simultaneously measure 10 out of the 12 components...
FIGURES | View All (5)
Journal Article
Published: 01 February 1996
Bulletin of the Seismological Society of America (1996) 86 (1A): 212–220.
... and elastic-wave theory by comparing such estimated strains with strains measured on a three-component long-base strainmeter system at Piñon Flat, California. We quantify the uncertainties and errors through cross-spectral analysis of data from three regional earthquakes (the M 0 = 4 × 10 17 N-m St. George...
Journal Article
Published: 01 April 1989
Bulletin of the Seismological Society of America (1989) 79 (2): 480–492.
...Duncan Carr Agnew; Frank K. Wyatt Abstract We describe observations at Piñon Flat Observatory of preseismic, co-seismic, and postseismic strain and tilt changes associated with the Superstition Hills earthquake sequence of 24 November 1987. The data come from two long-base strainmeters, one long...
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Instrumental setting at <span class="search-highlight">Piñon</span> <span class="search-highlight">Flat</span> <span class="search-highlight">Observatory</span> (red triangle on overview ma...
Published: 24 May 2017
Figure 1. Instrumental setting at Piñon Flat Observatory (red triangle on overview map). Red dot marks the epicenter of the analyzed earthquake. The 13 seismic stations are color coded according to array aperture. Station 01 is selected as the center station. Stations marked by filled and open
Journal Article
Published: 27 August 2019
Bulletin of the Seismological Society of America (2019) 109 (5): 1948–1967.
...Lei Qin; Frank L. Vernon; Christopher W. Johnson; Yehuda Ben‐Zion Abstract We investigate coherences of seismic data recorded during three years (2015–2017) at the Piñon Flats Observatory (PY) array and a collocated 148 m deep borehole station B084, along with oceanic data from a buoy southwest...
FIGURES | View All (17)
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(a) Large‐scale map showing the locations of <span class="search-highlight">Piñon</span> <span class="search-highlight">Flats</span> <span class="search-highlight">Observatory</span> (PY) a...
Published: 27 August 2019
Figure 1. (a) Large‐scale map showing the locations of Piñon Flats Observatory (PY) array (triangle), the 2016 M w  5.2 Borrego Springs earthquake (BSE, star), and the buoy sensor 46086 (filled circle). (b) The PY array layout with three eccentric circles (dashed circles). All stations
Journal Article
Published: 01 June 1994
Bulletin of the Seismological Society of America (1994) 84 (3): 768–779.
...Frank K. Wyatt; Duncan Carr Agnew; Michael Gladwin Abstract We describe, and attempt to interpret, continuous measurements of strains and tilts made at Piñon Flat Observatory (PFO) before, during, and after the Landers and Joshua Tree earthquake sequences. These data show substantial transient...
Journal Article
Published: 23 June 2020
Bulletin of the Seismological Society of America (2020) 110 (6): 3196–3210.
... two additional stations both collocated at the Piñon Flats Observatory (PFO) in southern California (networks TA and Incorporated Research Institutions for Seismology [IRIS] International Deployment of Accelerometers [IDA]). We find a good agreement between the acceleration‐tilt derived from the TA...
FIGURES | View All (8)
Journal Article
Published: 22 July 2014
Bulletin of the Seismological Society of America (2014) 104 (4): 1846–1859.
... and teleseismic distances. The formulas are fits to data from 89 large (6.5≤ M w ≤9.0) shallow earthquakes, with source distances between 500 and 16,000 km, recorded between 1977 and 2013 by three long‐base laser strainmeters at Piñon Flat Observatory in southern California; these strainmeters provide uniquely...
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Journal Article
Published: 01 August 1997
Bulletin of the Seismological Society of America (1997) 87 (4): 1078–1080.
... of long-base strainmeters sited on low-velocity materials (such as the 732-m-long strainmeters at Piñon Flat Observatory) may require correction for amplitude distortion. Bulletin of the Seismological Society of America, Vol. 87, No. 4, pp. 1078-1080, August 1997 Frequency Response of a Strainmeter...
Journal Article
Published: 01 December 1996
Bulletin of the Seismological Society of America (1996) 86 (6): 1830–1844.
...G. Eli Baker; J. Bernard Minster; George Zandt; H. Gurrola Abstract We use teleseismic P waves recorded at Piñon Flat Observatory ( PFO ) to constrain the three-dimensional crustal and upper-mantle velocity structure beneath the station. By forward modeling radial receiver function waveforms, we...
Journal Article
Published: 01 December 1995
Bulletin of the Seismological Society of America (1995) 85 (6): 1873–1878.
... earthquake prediction. The 1992 Landers earthquake ( M 7.3) had a distinctive foreshock sequence and initiated only 70 km from the strain meters at the Piñon Flat Observatory ( PFO ). We use this earthquake to investigate the validity and usefulness of Ohnaka's model. The accurate relocations of Dodge et al...
Journal Article
Published: 01 August 1990
Bulletin of the Seismological Society of America (1990) 80 (4): 807–831.
... (Keenwild fire station), which is located along a ridge line about 8.7 km east of the San Jacinto Fault zone. Station PFO (Piñon Flat Observatory), chosen for the second site, is another 6 km further to the east of station KNW and is located on a gently sloping hillside. We logged each borehole for P...
Journal Article
Published: 01 October 1988
Bulletin of the Seismological Society of America (1988) 78 (5): 1693–1706.
...N. E. King; D. C. Agnew; F. Wyatt Abstract We present a procedure for comparing strain events at different sites, and apply it to observations for the Homestead Valley earthquake sequence of 15 March 1979. Coseismic strain steps occurred on two laser strainmeters at Piñon Flat Observatory ( PFO...
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Impedance polar diagrams of the MT sites from profile 1 (Figure  8 ). The a...
Published: 21 January 2021
were estimated using cross-correlations of the magnetic field measured at the Piñon Flat Observatory (350 km away), Southern California, with rotated magnetic fields recorded at the MT receivers.
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(a) Radial and transverse strains from the earthquake on day 174, 2001 ( M ...
Published: 22 July 2014
236°). Figure  1 shows the paths from Piñon Flat Observatory ( PFO ) to these events.
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Detection of train passages in the Coachella Valley. (a) Layout of the dens...
Published: 20 January 2021
in the correlations, traveling between Piñon Flat Observatory (PFO) and Cahuilla Reservation (CIR). Orange areas show the zones of sensitivity to the structure for a wave reconstructed by interferometry between the two arrays. The railway and the main highway are shown in blue. The active tectonic faults are shown
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Distribution of the observed seismic noise amplitude of acceleration (red l...
Published: 23 June 2020
Flats Observatory (PFO) and theoretical tilt A th , calculated over all 360 azimuths. Violet and green lines show the tiltmeters results from Wyatt and Berger (1980) , light blue and red lines are from Wyatt et al. (1982) . Dark blue line shows theoretical azimuthal tilt variation.
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Location map showing the seismic stations used in our analysis, including P...
Published: 16 October 2018
amplitude at B084. The black curve overlaying the histogram shows the predicted amplitude at Piñon Flat Observatory (PFO) as a function of azimuth to a source moving along line A–A′. The PFO array configuration is shown in the inset map.The color version of this figure is available only in the electronic
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Time series of the instantaneous measured rate of rotation of the GEOsensor...
Published: 01 May 2009
Figure 3. Time series of the instantaneous measured rate of rotation of the GEOsensor taken at the Piñon Flat Seismological Observatory.