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Geodetic Measurement of Deformation East of the San Andreas Fault in Central California

机译:加利福尼亚中部圣安德烈亚斯断层以东变形的大地测量

摘要

Triangulation and trilateration data from two geodetic networks located between the western edge of the Great Valley and the San Andreas fault have been used to calculate shear strain rates in the Diablo Range and to estimate the slip rate along the Calaveras and Paicines faults in Central California. Within the Diablo Range the average shear strain rate was determined for the time period between 1962 and 1982 to be 0.15 + or - 0.08 microrad/yr, with the orientation of the most compressive strain at N 16 deg E + or - 14 deg. The orientation of the principal compressive strain predicted from the azimuth of the major structures in the region is N 25 deg E. It is inferred that the measured strain is due to compression across the folds of this area: the average shear straining corresponds to a relative shortening rate of 4.5 + or - 2.4 mm/yr. From an examination of wellbore breakout orientations and the azimuths of P-axes from earthquake focal mechanisms the inferred orientation of maximum compressive stress was found to be similar to the direction of maximum compressive strain implied by the trend of local fold structures. Results do not support the hypothesis of uniform fault-normal compression within the Coast Ranges. From trilateration measurements made between 1972 and 1987 on lines that are within 10 km of the San Andreas fault, a slip rate of 10 to 12 mm/yr was calculated for the Calaveras-Paicines fault south of Hollister. The slip rate of the Paicines fault decreases to 4 mm/yr near Bitter.
机译:来自位于大山谷西边缘和圣安德烈亚斯断层之间的两个大地测量网络的三角测量和三边测量数据已被用于计算暗黑破坏神山脉的剪切应变率,并估计了加利福尼亚中部卡拉维拉斯和佩辛斯断层的滑移率。在暗黑破坏神范围内,1962年至1982年之间的平均剪切应变率确定为0.15 +或-0.08 microrad / yr,其中最大压缩应变的方向为N 16度E +或-14度。根据该区域主要结构的方位角预测的主压缩应变的方向为N 25度E。推断测得的应变是由于该区域褶皱上的压缩所致:平均剪切应变对应于相对应力缩短率4.5 +或-2.4毫米/年。通过检查井筒破裂方向和地震震源机制的P轴方位,发现最大压缩应力的方向与局部褶皱结构趋势所暗示的最大压缩应变方向相似。结果不支持海岸范围内均匀断层-法向压缩的假设。根据1972年至1987年之间在San Andreas断层10 km以内的线路上进行的三边测量,对Hollister以南的Calaveras-Paicines断层的滑动速率计算为10至12 mm / yr。 Paicines断层的滑动率在苦涩附近降低至4 mm / yr。

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