...Denis Jongmans; Peter E. Malin Abstract High-gain three-component seismometers from 0- to 1-km deep along the Varian A-1 well at Parkfield, California, were used to record the waveforms of nearby microearthquakes. Despite being in the thick Tertiary sediments of the Parkfield Syncline, the S -wave...

... isotropy with a horizontal axis of symmetry. Geological studies of Sims (1990) in the area place the Varian well on the west limb of the narrow, thrust-fault bounded Parkfield syncline which parallels the San Andreas fault. The well penetrates the Miocene Etchegoin, Monterey and Temblor formations...

... on both sides of the A venal syncline. The upper Miocene deposits on the north flank of the Pyramid Hills anticline toward the northwest are cut off at the Waltham Canyon fault and strike into the Franciscan rocks of the Parkfield block; the Miocene deposits in the Avenal syncline are likewise cut off...

... complexity of the San Andreas fault in the vicinity of Parkfield. Major structural features of the area are the Southwest fracture zone, the Parkfield syncline, and tectonically transported blocks composed of Miocene volcanic rocks and Jurassic quartz hornblende gabbro of Gold Hill. The Southwest fracture...

... fault that strikes parallel to the main San Andreas fault ( Jungmans and Malin, 1995 ). The borehole penetrates exhumed upper Cenozoic sediments of the Parkfield syncline. The sand‐rich Etchegoin Formation (e.g., Scheirer and Magoon, 2007 ) occurs in the upper ∼480 of the hole and the more clay‐rich...

... £. 29° Epicenter ~ ~ \ ~ Salinian X; - o Block G f- 0 ~. Southern = j~_ Achve -e% 12o° 116° ,2o03o, "\ 55°45 -4- "' ~Coast RangeThrust ~kNeogeneThrust Fro. 1. Location map showing principal structural axes and survey stations. WCF = Waltham Canyon Fault; MFZ = Maxey Fault Zone; PS = Parkfield Syncline...

...-known transition from locked to creeping behavior near Parkfield, predicts first-order variations in the GPS velocity field along the fault and corresponding variations in dilatational strain rates. The strain rate pattern is dominated by a large contractional region northeast of the transition from...

...-lateral offset between the seismic profile and its eastward projection to cross section EE′. The seismic profile must be projected ∼600 m farther south, where it would be on the limb of the syncline and incompatible with the low-angle dips observed in the seismic data.” Comment: “Cracking only...

... that is not reflected in an underlying, apparently monoclinal, series of Oligocene beds. Not far from this locality a broad syncline of Etchegoin (Pliocene) overlies vertical beds of Vaqueros. The great overlap of the Santa Margarita and Etchegoin brings these formations into contact with all the older ones...

... with an anticline and syncline of the subjacent Miocene. The metamorphic rocks appear to be certainly older than Cretaceous, because no such severely altered sediments are known in the Cretaceous in California. They may be much older because they resemble the ancient rocks of the Mojave Desert region (lower...

...-Effects Test Area near Parkfield, California. Observed site response relative to a bedrock reference site was determined for a given site by using the Fourier amplitude spectral ratio method. Two separate studies were conducted: a profile study and a site-specific study. Surface bedrock site response...

... the Shuanghe anticline on the east to the Yutan anticline on the west with the maximum depth from 5 to 10 km, which are associated with obvious high‐ V S and low‐ V P / V S features. The relocated seismic clusters in the Luochang–Jianwu syncline area have different strikes and dips, which are mainly located...

... and NE of Bristol in the SW of Britain ( Fig. 1 ) where it forms a north–south-orientated rhombic-shaped outcrop of ~90 km 2 . The Warwickshire Group consists of two distinct outcrops: the Coalpit Heath Syncline in the north is separated from the southern outcrop by a wedge of South Wales Coal Measures...

...-Dimensional Velocity Structure along the Synclinal Axis of the Great Valley, California . . . . . . . . . . . . . . . . . . . . . . Colombia Aftershocks Using Digital Surface-Wave Data, Source Mechanisms of, by Carlos Mendoza Comment on "Analysis of Broadband Seismograms from the Chile-Peru Area" by R. Kind...

.... Bakun W. K. Casaday K. B. (1967) . The Parkfield, California earthquakes of 1966 , Bull. Seism. Soc. Am. 57 , 1221 . McEvilly T. V...

... 1999 Fuis, Murphy, et al. (2001) 1999 78 925 Parkfield Thurber et al. (2003 , 2004) ; Hole et al. (2006) 2003 157 242 Network Northern and Southern California Earthquake Data Center 1976–2003 270 659 The model presented in this study is obtained by using a regional...

... R. M. Foxall W. McEvilly T. V. (1995) . Clustering and periodic recurrence of microearthquakes on the San Andreas Fault at Parkfield, California , Science 267 , 503...

... of Figure 2 . Abbreviations: A—Point Año Nuevo; BS—Big Sur; CF— Calaveras fault; HF— Hayward fault; M—Monterey; MB—Morro Bay; OSM—Offshore Santa Maria basin (shaded light brown); OWH—Oceanic-West Huasna fault; P—Piedras Blancas; PA—Point Arguello; PF—Parkfield; PS—Point Sur; SAF—San Andreas fault; SC—Santa...

... extends along the axis of the Arun river ( Monsolve et al., 2006 ) besides other transverse folds like Kanchanzonga-Dharan bazar syncline, Sunkoshi anticline etc. Further south, in the Ganga basin, major transverse features are Monghyr-Saharsa ridge in Bihar and Dhubri fault near the western edge...

... province and continues westward offshore ( Figure 1 ). The Pismo and Huasna basins are two smaller basins located north of the Santa Maria basin, along the Pismo and Huasna synclines of the southern Coast Ranges ( Figure 2 ). All of these basins contain thick Neogene sedimentary sections that include...