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Pinon Flats

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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)
Journal Article
Published: 01 June 1999
Bulletin of the Seismological Society of America (1999) 89 (3): 693–705.
...-estimators applied to individual phase factors in the complex plane. The method is applied to data from three-component array experiments conducted at Piñon Flats, California, in 1990 and 1991. We find remarkable departures of P -wave particle motions from the pure longitudinal motion expected...
Image
(a) Large‐scale map showing the locations of <b>Piñon</b> <b>Flats</b> Observatory (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 December 1995
Bulletin of the Seismological Society of America (1995) 85 (6): 1758–1769.
.... This phenomenon, however, is strongly frequency dependent. At the Piñon Flat site, variations in power spectral estimates exceed a factor of 100 at frequencies over 4 Hz. Analysis of teleseismic signals, however, demonstrates that these variations diminish rapidly at lower frequencies and falls to negligible...
Image
Instrumental setting at <b>Piñon</b> <b>Flat</b> Observatory (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
Image
Example of two small local tremors measured in <b>Piñon</b> <b>Flat</b>. The observed rot...
Published: 01 May 2009
Figure 4. Example of two small local tremors measured in Piñon Flat. The observed rotation rates are up to 150 nrad/sec.
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...
Journal Article
Published: 24 May 2017
Seismological Research Letters (2017) 88 (4): 1107–1116.
...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...
FIGURES | View All (5)
Journal Article
Journal: Geophysics
Published: 01 December 1999
Geophysics (1999) 64 (6): 1828–1835.
...Stanley J. Radzevicius; Gary L. Pavlis Abstract We analyze data from two orthogonal seismic lines 336 m in length collected at Pinon Flat, California, over weathered granodiorite bedrock. Each line was made up of 10 reversed segments 84 m in length. We analyzed the first arrivals from these data...
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 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: 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...
FIGURES | View All (9)
Journal Article
Published: 01 May 2009
Bulletin of the Seismological Society of America (2009) 99 (2B): 1190–1198.
...Figure 4. Example of two small local tremors measured in Piñon Flat. The observed rotation rates are up to 150 nrad/sec. ...
FIGURES | View All (10)
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. 04 2 1997 Copyright © 1997, by the Seismological Society of America References Benioff H. (1935...
Journal Article
Published: 01 December 1996
Bulletin of the Seismological Society of America (1996) 86 (6): 1733–1748.
... local and regional earthquakes on digital recorders, both at the surface and in boreholes, at two rock sites and one basin site in the San Jacinto mountains, southern California. The two rock sites, Keenwild and Piñon Flat, are located on granitic bedrock of the southern California peninsular ranges...
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 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: 01 December 1991
Bulletin of the Seismological Society of America (1991) 81 (6): 2458–2485.
... at remote sites. Such seismometers, using Mark Products L-22D 2-Hz geophones, have been installed at several sites in California: at the bottom of adjacent boreholes ∼ 150 and ∼ 300 m deep, in granite at station KNW near Keenwild and at Piñon Flat of the Anza digital seismic array, and at the bottom...
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...