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![Comparison of 30-m averaged velocity estimates at ten sites. Shear velocities derived from microtremor modeling are plotted on the horizontal axis. Shear velocities estimated from coincident P-wave refraction results are plotted on the vertical, after assuming a Poisson ratio of 0.25 in converting to a shear velocity. In the Santa Clarita Valley and western Mojave Desert of southern California: nfs, Newhall Fire Station (Fig. 4); mcs, Mill Creek Summit; glr, Gleason Road 0.5 km from mcs; anb Antelope Buttes; ljb, Lovejoy Buttes; alc, Aliso Canyon; and pib, Piute Butte. In Nevada; rno, Reno/Tahoe Airport (Fig. 1 and 2). In Wellington, New Zealand: pky, Parkway (Fig. 5); STN, Seatoun.]()
![(A) Gravity data along the LARSE II transect. Predicted gravity curve is calculated from the 3D velocity model (see panel C) using velocity-density relationships discussed in the text. Bouguer (solid red and blue circles) and isostatic gravity (open magenta and blue circles) data show highs associated with the Santa Monica Mountains and central Transverse Ranges and lows associated with the San Fernando, Santa Clarita, and Antelope Valley basins. Basins are labeled at the top of the figure: SFVB, San Fernando Valley basin; EVB, east Ventura basin; RSB, Ridge and Soledad basins (positioned west and east of the LARSE II line 2, respectively); BC, Bee Canyon basin (subbasin of the Soledad basin); and WAB, west Antelope Valley basin. The east Ventura and Ridge/Soledad basins together underlie the Santa Clarita Valley along line 2. Surface bedrock geologic units are PS, Pelona Schist; =, pre-ambrian gneiss; Mz, Mesozoic intrusives. (B) DLS inversion model (finer gridded version; see text), from the method of Lutter et al. (1999), fits 7500 travel times to an average rms error of 53 msec. Faults are abbreviated as in Figure 1. Additional faults are abbreviated as follows: GF, Garlock Fault; SAF, San Andreas Fault (dashed white line); and SGF, San Gabriel Fault. The Santa Monica Mountains and Santa Susana Mountains are abbreviated SMM and SSM, respectively. Thin black lines are velocity contours (contour interval, 0.25 km/sec). Heavy black line segments are sediment-basement contacts determined from oil-test well data within 0-2.5 km of line 2, or, in the San Fernando Valley, from a refraction cross line. See Figure 1 for well identifications; gray fill in lower part of well h represents sedimentary basement rocks, where the sonic log indicates a velocity of ∼5 km/sec. (C) 3D velocity model, from the method of Hole (1992), fits 20,000 travel times to an rms error of 41 msec. Shown is central slice of 3D model, which lies along line 2 and is coincident with DLS model profile of (B). Faults, sediment-basement contacts, and oil-test wells are the same as in (B). A diagonal resolution value of 0.4 from the coarser-grid DLS model (see text) truncates the colored regions of both models. The Northridge (blue) and San Fernando (red) mainshock focal mechanisms (vertically exaggerated) are superimposed. Aftershocks of Northridge (blue) and San Fernando (red-brown) earthquakes are from Fuis et al. (2003a). (These were relocated using the model of Hauksson [2000] improved using LARSE II shots; they are projected onto line 2 from a zone 0-10 km east of line 2.) Heavy blue line, causative fault for Northridge earthquake; heavy magenta lines, faults of the San Fernando Fault system (from Fuis et al., 2003a).]()
![(A) Gravity data along the LARSE II transect. Predicted gravity curve is calculated from the 3D velocity model (see panel C) using velocity-density relationships discussed in the text. Bouguer (solid red and blue circles) and isostatic gravity (open magenta and blue circles) data show highs associated with the Santa Monica Mountains and central Transverse Ranges and lows associated with the San Fernando, Santa Clarita, and Antelope Valley basins. Basins are labeled at the top of the figure: SFVB, San Fernando Valley basin; EVB, east Ventura basin; RSB, Ridge and Soledad basins (positioned west and east of the LARSE II line 2, respectively); BC, Bee Canyon basin (subbasin of the Soledad basin); and WAB, west Antelope Valley basin. The east Ventura and Ridge/Soledad basins together underlie the Santa Clarita Valley along line 2. Surface bedrock geologic units are PS, Pelona Schist; =, pre-ambrian gneiss; Mz, Mesozoic intrusives. (B) DLS inversion model (finer gridded version; see text), from the method of Lutter et al. (1999), fits 7500 travel times to an average rms error of 53 msec. Faults are abbreviated as in Figure 1. Additional faults are abbreviated as follows: GF, Garlock Fault; SAF, San Andreas Fault (dashed white line); and SGF, San Gabriel Fault. The Santa Monica Mountains and Santa Susana Mountains are abbreviated SMM and SSM, respectively. Thin black lines are velocity contours (contour interval, 0.25 km/sec). Heavy black line segments are sediment-basement contacts determined from oil-test well data within 0-2.5 km of line 2, or, in the San Fernando Valley, from a refraction cross line. See Figure 1 for well identifications; gray fill in lower part of well h represents sedimentary basement rocks, where the sonic log indicates a velocity of ∼5 km/sec. (C) 3D velocity model, from the method of Hole (1992), fits 20,000 travel times to an rms error of 41 msec. Shown is central slice of 3D model, which lies along line 2 and is coincident with DLS model profile of (B). Faults, sediment-basement contacts, and oil-test wells are the same as in (B). A diagonal resolution value of 0.4 from the coarser-grid DLS model (see text) truncates the colored regions of both models. The Northridge (blue) and San Fernando (red) mainshock focal mechanisms (vertically exaggerated) are superimposed. Aftershocks of Northridge (blue) and San Fernando (red-brown) earthquakes are from Fuis et al. (2003a). (These were relocated using the model of Hauksson [2000] improved using LARSE II shots; they are projected onto line 2 from a zone 0-10 km east of line 2.) Heavy blue line, causative fault for Northridge earthquake; heavy magenta lines, faults of the San Fernando Fault system (from Fuis et al., 2003a).]()
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1
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Conceptual site model of the Santa Clarita Valley. Available to Purchase
in Simulating Dynamic Water Supply Systems in a Fully Integrated Surface–Subsurface Flow and Transport Model All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher.
> Vadose Zone Journal
Published: 01 November 2009
F ig . 2. Conceptual site model of the Santa Clarita Valley.
Journal Article
Upper Crustal Structure from the Santa Monica Mountains to the Sierra Nevada, Southern California: Tomographic Results from the Los Angeles Regional Seismic Experiment, Phase II (LARSE II) Available to Purchase
Publisher: Seismological Society of America
Published: 01 April 2004
Bulletin of the Seismological Society of America (2004) 94 (2): 619–632.
... sedimentary basins beneath the San Fernando and Santa Clarita Valleys and the deep structure of major faults along the transect, including causative faults for the 1971 M 6.7 San Fernando and 1994 M 6.7 Northridge earthquakes, the San Gabriel Fault, and the San Andreas Fault. Tomographic modeling of first...
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Journal Article
Simulating Dynamic Water Supply Systems in a Fully Integrated Surface–Subsurface Flow and Transport Model All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Available to Purchase
Journal: Vadose Zone Journal
Publisher: Soil Science Society of America
Published: 01 November 2009
Vadose Zone Journal (2009) 8 (4): 858–872.
...F ig . 2. Conceptual site model of the Santa Clarita Valley. ...
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Image
Comparison of 30-m averaged velocity estimates at ten sites. Shear velociti... Available to Purchase
in Faster, Better: Shear-Wave Velocity to 100 Meters Depth from Refraction Microtremor Arrays
> Bulletin of the Seismological Society of America
Published: 01 April 2001
in converting to a shear velocity. In the Santa Clarita Valley and western Mojave Desert of southern California: nfs , Newhall Fire Station ( Fig. 4 ); mcs , Mill Creek Summit; glr , Gleason Road 0.5 km from mcs ; anb Antelope Buttes; ljb , Lovejoy Buttes; alc , Aliso Canyon; and pib , Piute Butte
Image
![(A) Gravity data along the LARSE II transect. Predicted gravity curve is calculated from the 3D velocity model (see panel C) using velocity-density relationships discussed in the text. Bouguer (solid red and blue circles) and isostatic gravity (open magenta and blue circles) data show highs associated with the Santa Monica Mountains and central Transverse Ranges and lows associated with the San Fernando, Santa Clarita, and Antelope Valley basins. Basins are labeled at the top of the figure: SFVB, San Fernando Valley basin; EVB, east Ventura basin; RSB, Ridge and Soledad basins (positioned west and east of the LARSE II line 2, respectively); BC, Bee Canyon basin (subbasin of the Soledad basin); and WAB, west Antelope Valley basin. The east Ventura and Ridge/Soledad basins together underlie the Santa Clarita Valley along line 2. Surface bedrock geologic units are PS, Pelona Schist; =, pre-ambrian gneiss; Mz, Mesozoic intrusives. (B) DLS inversion model (finer gridded version; see text), from the method of Lutter et al. (1999), fits 7500 travel times to an average rms error of 53 msec. Faults are abbreviated as in Figure 1. Additional faults are abbreviated as follows: GF, Garlock Fault; SAF, San Andreas Fault (dashed white line); and SGF, San Gabriel Fault. The Santa Monica Mountains and Santa Susana Mountains are abbreviated SMM and SSM, respectively. Thin black lines are velocity contours (contour interval, 0.25 km/sec). Heavy black line segments are sediment-basement contacts determined from oil-test well data within 0-2.5 km of line 2, or, in the San Fernando Valley, from a refraction cross line. See Figure 1 for well identifications; gray fill in lower part of well h represents sedimentary basement rocks, where the sonic log indicates a velocity of ∼5 km/sec. (C) 3D velocity model, from the method of Hole (1992), fits 20,000 travel times to an rms error of 41 msec. Shown is central slice of 3D model, which lies along line 2 and is coincident with DLS model profile of (B). Faults, sediment-basement contacts, and oil-test wells are the same as in (B). A diagonal resolution value of 0.4 from the coarser-grid DLS model (see text) truncates the colored regions of both models. The Northridge (blue) and San Fernando (red) mainshock focal mechanisms (vertically exaggerated) are superimposed. Aftershocks of Northridge (blue) and San Fernando (red-brown) earthquakes are from Fuis et al. (2003a). (These were relocated using the model of Hauksson [2000] improved using LARSE II shots; they are projected onto line 2 from a zone 0-10 km east of line 2.) Heavy blue line, causative fault for Northridge earthquake; heavy magenta lines, faults of the San Fernando Fault system (from Fuis et al., 2003a).](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/bssa/94/2/10.1785_0120030058/4/s_94.2.619_Cstrok.jpeg?Expires=2147483647&Signature=qgJinxNr979GplLRmOeURJ-kjf6Xkj4cJc~ab~zkvQoToNDHXfWFaS4l78xXDIZP4ub2w9iO8mxrQoSGCMruWlhuNvHh~e8PzJOfZWgkA19Xx1eVlVb1sVtG02pw0fSK46nucKjg-0rZpubm2wJbBcb5pypmVY2sE-XfBOyZElVxRAuXc6Mba301gVi3liPeIyCctvTTKRReIDEOF8wQByX6y709DHdAOUft15M8xCv40-JBIFroOLQ12tuiGQbzCDRbZTB1d1RGApAaeB~sM3P0Sk1nUAUaX7EBs5ePnghQJaeRW1sXD81dZM6qy1lyGPeFCSxgmfV9aL6usZrBGw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
(A) Gravity data along the LARSE II transect. Predicted gravity curve is ca... Available to Purchase
in Upper Crustal Structure from the Santa Monica Mountains to the Sierra Nevada, Southern California: Tomographic Results from the Los Angeles Regional Seismic Experiment, Phase II (LARSE II)
> Bulletin of the Seismological Society of America
Published: 01 April 2004
highs associated with the Santa Monica Mountains and central Transverse Ranges and lows associated with the San Fernando, Santa Clarita, and Antelope Valley basins. Basins are labeled at the top of the figure: SFVB, San Fernando Valley basin; EVB, east Ventura basin; RSB, Ridge and Soledad basins
Image
![(A) Gravity data along the LARSE II transect. Predicted gravity curve is calculated from the 3D velocity model (see panel C) using velocity-density relationships discussed in the text. Bouguer (solid red and blue circles) and isostatic gravity (open magenta and blue circles) data show highs associated with the Santa Monica Mountains and central Transverse Ranges and lows associated with the San Fernando, Santa Clarita, and Antelope Valley basins. Basins are labeled at the top of the figure: SFVB, San Fernando Valley basin; EVB, east Ventura basin; RSB, Ridge and Soledad basins (positioned west and east of the LARSE II line 2, respectively); BC, Bee Canyon basin (subbasin of the Soledad basin); and WAB, west Antelope Valley basin. The east Ventura and Ridge/Soledad basins together underlie the Santa Clarita Valley along line 2. Surface bedrock geologic units are PS, Pelona Schist; =, pre-ambrian gneiss; Mz, Mesozoic intrusives. (B) DLS inversion model (finer gridded version; see text), from the method of Lutter et al. (1999), fits 7500 travel times to an average rms error of 53 msec. Faults are abbreviated as in Figure 1. Additional faults are abbreviated as follows: GF, Garlock Fault; SAF, San Andreas Fault (dashed white line); and SGF, San Gabriel Fault. The Santa Monica Mountains and Santa Susana Mountains are abbreviated SMM and SSM, respectively. Thin black lines are velocity contours (contour interval, 0.25 km/sec). Heavy black line segments are sediment-basement contacts determined from oil-test well data within 0-2.5 km of line 2, or, in the San Fernando Valley, from a refraction cross line. See Figure 1 for well identifications; gray fill in lower part of well h represents sedimentary basement rocks, where the sonic log indicates a velocity of ∼5 km/sec. (C) 3D velocity model, from the method of Hole (1992), fits 20,000 travel times to an rms error of 41 msec. Shown is central slice of 3D model, which lies along line 2 and is coincident with DLS model profile of (B). Faults, sediment-basement contacts, and oil-test wells are the same as in (B). A diagonal resolution value of 0.4 from the coarser-grid DLS model (see text) truncates the colored regions of both models. The Northridge (blue) and San Fernando (red) mainshock focal mechanisms (vertically exaggerated) are superimposed. Aftershocks of Northridge (blue) and San Fernando (red-brown) earthquakes are from Fuis et al. (2003a). (These were relocated using the model of Hauksson [2000] improved using LARSE II shots; they are projected onto line 2 from a zone 0-10 km east of line 2.) Heavy blue line, causative fault for Northridge earthquake; heavy magenta lines, faults of the San Fernando Fault system (from Fuis et al., 2003a).](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/bssa/94/2/10.1785_0120030058/4/s_942_03058_03.jpeg?Expires=2147483647&Signature=1PgvLp0qG03ggGaXz91iPesf5suPmAFru53JKAj83slxt9r3xDHjZID09bvCzyiIWBkWQL4gaU3VLuQsIm1wC6Zn5cnpIF7wVtW8mneH7WA8za4ClATdOhu9iidY75JFQ~ebn7ORUf0z5I5of7zM1T1SYeXD8aK5Lzy~PfLhDICoXcCwJtY2dpeitriDp9-ktHrVFLds47wF7qxT-HeWldZVdKUbEHFZCMXVs2PzIPkyjyiI4wpb4lw4Wb-wFeZ6N9RC9qszVdLLAmHn5Jq-5J6UFAr-n5RFslHG5eounzd2YTWZZjqDynDyYLAkPyMLB2d5CVtiI3bIWNl5NJ0OUQ__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
(A) Gravity data along the LARSE II transect. Predicted gravity curve is ca... Available to Purchase
in Upper Crustal Structure from the Santa Monica Mountains to the Sierra Nevada, Southern California: Tomographic Results from the Los Angeles Regional Seismic Experiment, Phase II (LARSE II)
> Bulletin of the Seismological Society of America
Published: 01 April 2004
highs associated with the Santa Monica Mountains and central Transverse Ranges and lows associated with the San Fernando, Santa Clarita, and Antelope Valley basins. Basins are labeled at the top of the figure: SFVB, San Fernando Valley basin; EVB, east Ventura basin; RSB, Ridge and Soledad basins
Journal Article
Detailed P - and S -Wave Velocity Models along the LARSE II Transect, Southern California Available to Purchase
Publisher: Seismological Society of America
Published: 01 December 2010
Bulletin of the Seismological Society of America (2010) 100 (6): 3194–3212.
... Fernando Valley, Santa Susana Mountains, Santa Clarita Valley, north-central Transverse Ranges, and western Mojave Desert (Antelope Valley), with a sparsely recorded extension through the Tehachapi Mountains and into the southern Sierra Nevada. Although V P models have been previously obtained...
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Journal Article
Lifeline utilities performance in the 17 January 1994 Northridge, California, earthquake Available to Purchase
Publisher: Seismological Society of America
Published: 01 February 1996
Bulletin of the Seismological Society of America (1996) 86 (1B): S350–S361.
..., rigid bus, coupling capacitor Simi, Santa Clarita, and San Fernando Valleys, which sup- voltage transformers (CCVT's), capacitor banks, circuit plied three water treatment plants. The breaks in 54-, 77-, switches, and a 34.5-kv bus. Dead tank circuit breakers (Fig. 5) and bulk oil circuit breakers...
Journal Article
Fault systems of the 1971 San Fernando and 1994 Northridge earthquakes, southern California: Relocated aftershocks and seismic images from LARSE II Available to Purchase
Journal: Geology
Publisher: Geological Society of America
Published: 01 February 2003
Geology (2003) 31 (2): 171–174.
... teleseismic depth phases. High-amplitude bands of energy are present in our image beneath the San Fernando and Santa Clarita Valleys ( Fig. 2 ). These bands result from stacking CMP sections out to 25 km offsets and, thus, wide angles. They do not represent true reflections but a combination...
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Journal Article
Incidents of ground failure from the 1994 Northridge earthquake Available to Purchase
Publisher: Seismological Society of America
Published: 01 February 1996
Bulletin of the Seismological Society of America (1996) 86 (1B): S300–S318.
... ,
February .
City of San Fernando
(1995) .
Location Map, Earthquake Damaged Water Main .
City of Santa Clarita
(1991) .
Safety Element of the City of Santa Clarita General Plan, June .
City of Simi Valley
(1994) .
Personal...
Journal Article
Landslides triggered by the 1994 Northridge, California, earthquake Available to Purchase
Publisher: Seismological Society of America
Published: 01 February 1996
Bulletin of the Seismological Society of America (1996) 86 (1B): S319–S332.
... and rock slides closed many of the alternate routes across the San Gabriel Mountains from the Lancaster/Palmdale and Santa Clarita Valley areas to Los Angeles, and it was several days before some of these routes were cleared of rock debris and made available to commuters. Dozens of homes in the central...
Journal Article
Improved Basin Structures in Southern California Obtained Through Full‐3D Seismic Waveform Tomography (F3DT) Available to Purchase
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 11 May 2016
Seismological Research Letters (2016) 87 (4): 874–881.
... experiment ( LARSE )‐II 2D tomography profile shows that the sediments in the San Fernando Valley are 2–3 km deeper than those in the Santa Clarita Valley, which show about the same depth as San Fernando Valley in CVM ‐S4 (Fig. 2 ) ( Lutter et al. , 2004 ). Along the same profile, CVM ‐S4.26 shows...
FIGURES
Image
Inventory predictions for cities with populations over 150,000 ... Available to Purchase
Published: 01 November 2012
Glendale 207,157 160 243 San Bernardino 205,010 5 81 Fremont 200,468 36 Huntington Beach 194,457 27 Irvine 186,852 4 Oxnard 183,628 20 Fontana 181,640 14 Moreno Valley 178,367 4 Santa Clarita 177,158 12 Ontario 172,701 22 Rancho Cucamonga 172,331
Journal Article
Testing Waveform Predictions of 3D Velocity Models against Two Recent Los Angeles Earthquakes Available to Purchase
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 01 October 2014
Seismological Research Letters (2014) 85 (6): 1275–1284.
... the LARSE‐II profile is shown on the right side of Figure 1 . In general, the P ‐wave velocities in CVM‐S4.26 have the highest correlation with the 2D model of Lutter et al. (2004) . In CVM‐S4, the P ‐wave velocities below the Santa Clarita Valley from about 3 km depth to about 6 km depth are too low...
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Book Chapter
Geological Investigation of a Portion of the San Gabriel Fault Southeast of Bouquet Junction, City of Santa Clarita, Southern California Available to Purchase
Series: Guidebook
Published: 01 January 2001
DOI: 10.32375/2001-GB77.9
EISBN: 9781732014893
Journal Article
Using safety inspection data to estimate shaking intensity for the 1994 Northridge earthquake Available to Purchase
Publisher: Seismological Society of America
Published: 01 October 1998
Bulletin of the Seismological Society of America (1998) 88 (5): 1243–1253.
... and Chuaqui data set to replace those these buildings to analyze statistically. in the OES data set for two municipalities (Burbank and Santa Clarita) where the OES data set appeared to be missing The data are compiled in Table 1, aggregated over all a significant number of red and yellow tags. census tracts...
Journal Article
Northridge Welded Steel Moment-Frame Damage Data and Its Use for Rapid Loss Estimation Available to Purchase
Journal: Earthquake Spectra
Publisher: Earthquake Engineering Research Institute
Published: 01 May 2003
Earthquake Spectra (2003) 19 (2): 335–364.
... bond issue to fund long- term loans for mandated WSMF repairs. 1998 1999: Burbank and Santa Monica require inspection and repair of WSMF buildings in accordance with FEMA and SAC guidelines. Other jurisdictions with known damage (including Santa Clarita, Glendale, Beverly Hills, and Simi Valley...
Journal Article
Radar Geology—Petroleum Exploration Technique, Eastern Panama and Northwestern Colombia Available to Purchase
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
Published: 01 May 1973
AAPG Bulletin (1973) 57 (5): 825–840.
... into three main physiographic-structural parts: two composite coastal mountain ranges separated by the taphrogenic Medial basin, which trends southeastward from the mouth of the Bayano River to the Atrato River valley of northwestern Colombia. Within the Medial basin, most of the clearly exposed surface...
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Journal Article
Interpretation of significant ground-response and structure strong motions recorded during the 1994 Northridge earthquake Available to Purchase
Publisher: Seismological Society of America
Published: 01 February 1996
Bulletin of the Seismological Society of America (1996) 86 (1B): S231–S246.
... to highlight impor- in Figure 3. The peak velocity was over 100 cm/sec at Tar- tant features of the ground-response data. The recorded ac- zana; velocities this high were also observed in the San Fer- celerograms from Tarzana, Sylmar, Arleta, and Santa Mon- nando Valley at Sylmar and the LADWP Rinaldi...
Journal Article
Ground-motion amplification in the Santa Monica area: Effects of shallow basin-edge structure Available to Purchase
Publisher: Seismological Society of America
Published: 01 October 1998
Bulletin of the Seismological Society of America (1998) 88 (5): 1224–1242.
...
A.
(1996) .
Rayleigh wave inversion for shallow and deep S-wave velocity structures in the San Fernando valley and Santa Monica by using an array measurement of microtremors ,
U.S. Geol. Surv. Final Technical Report ,
55 pp.
Levander
A. R...
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