Folds--Offshore of Carpinteria, California

This part of SIM 3261 presents data for folds for the geologic and geomorphic map (see sheet 10, SIM 3261) of the Offshore of Carpinteria map area, California. The vector data file is included in "Folds_OffshoreCarpinteria.zip," which is accessible from http://pubs.usgs.gov/ds/781/OffshoreCarpinteria/data_catalog_OffshoreCarpinteria.html.
This map area lies within the Western Transverse Ranges geologic province, which is north of the California Continental Borderland (Fisher and others, 2009). This province has undergone significant north-south compression since the Miocene, and recent GPS data suggest north-south shortening of about 6 to 10 mm/yr (Larson and Webb, 1992; Donnellan and others, 1993). The active, east-west-striking, north-dipping Pitas Point Fault (a broad zone that includes south-dipping reverse faults), Red Mountain Fault, and Rincon Creek Fault are some of the structures on which this shortening occurs (see, for example, Jackson and Yeats, 1982; Sorlien and others, 2000; Fisher and others, 2009). This fault system, in aggregate, extends for about 100 km through the Ventura and Santa Barbara Basins and represents an important earthquake hazard (see, for example, Fisher and others, 2009).
References Cited:
Donnellan, A., Hager, B.H., and King, R.W., 1993, Discrepancy between geologic and geodetic deformation rates in the Ventura basin: Nature, v. 346, p. 333-336.
Fisher, M.A., Sorlien, C.C., and Sliter, R.W., 2009, Potential earthquake faults offshore southern California from the eastern Santa Barbara channel to Dana Point, in Lee, H.J., and Normark, W.R., eds., Earth science in the urban ocean--The Southern California Continental Borderland: Geological Society of America Special Paper 454, p. 271-290.
Jackson, P.A., and Yeats, R.S., 1982, Structural evolution of Carpinteria basin, western Transverse Ranges, California: American Association of Petroleum Geologists Bulletin, v. 66, p. 805-829.
Larson, K.M., and Webb, F.H., 1992, Deformation in the Santa Barbara Channel from GPS measurements 1987-1991: Geophysical News Letters, v. 19, p. 1,491-1,494.
Sorlien, C.C., Gratier, J.P., Luyendyk, B.P., Hornafius, J.S., and Hopps, T.E., 2000, Map restoration of folded and faulted late Cenozoic strata across the Oak Ridge fault, onshore and offshore Ventura basin, California: Geological Society of America Bulletin, v. 112, p. 1,080-1,090.

本数据集为SIM 3261的组成部分，提供了加利福尼亚州卡平特里亚近海制图区地质与地貌图（详见SIM 3261第10幅）的褶皱相关数据。矢量数据文件收录于"Folds_OffshoreCarpinteria.zip"压缩包，可通过http://pubs.usgs.gov/ds/781/OffshoreCarpinteria/data_catalog_OffshoreCarpinteria.html获取。

该制图区坐落于加利福尼亚大陆边缘海域（California Continental Borderland）以北的西横向山脉地质省（Western Transverse Ranges geologic province）范围内。自中新世以来，该地质省经历了强烈的南北向挤压作用；最新GPS数据显示，其南北向缩短速率约为6~10 mm/yr（Larson等，1992；Donnellan等，1993）。此次缩短作用主要发生在一系列活动构造之上，包括呈东西走向、向北倾的皮塔斯角断层（Pitas Point Fault，为包含向南倾逆断层的宽阔断裂带）、红山断层（Red Mountain Fault）以及林孔溪断层（Rincon Creek Fault）（详见Jackson与Yeats，1982；Sorlien等，2000；Fisher等，2009）。该断层系整体延伸约100 km，横贯文图拉盆地与圣巴巴拉盆地，是重要的地震灾害构造（详见Fisher等，2009）。

【参考文献】
1. Donnellan, A., Hager, B.H., King, R.W., 1993, 文图拉盆地地质与大地测量变形速率间的差异：《自然》（*Nature*），第346卷，第333-336页。
2. Fisher, M.A., Sorlien, C.C., Sliter, R.W., 2009, 圣巴巴拉海峡东部至达纳点海域南加州近海潜在地震断层，收录于Lee, H.J. 与 Normark, W.R. 主编：《城市海洋中的地球科学——南加州大陆边缘海域》，美国地质学会特刊454，第271-290页。
3. Jackson, P.A., Yeats, R.S., 1982, 加利福尼亚州西横向山脉卡平特里亚盆地的构造演化：《美国石油地质学家协会通报》（*American Association of Petroleum Geologists Bulletin*），第66卷，第805-829页。
4. Larson, K.M., Webb, F.H., 1992, 1987-1991年GPS测量所得圣巴巴拉海峡形变：《地球物理新闻通讯》（*Geophysical News Letters*），第19卷，第1491-1494页。
5. Sorlien, C.C., Gratier, J.P., Luyendyk, B.P., Hornafius, J.S., Hopps, T.E., 2000, 加利福尼亚州文图拉盆地陆上及海域奥克里奇断层带褶皱与断裂晚新生代地层的制图恢复：《美国地质学会通报》（*Geological Society of America Bulletin*），第112卷，第1080-1090页。