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DOPPLER-RADAR ESTIMATES OF PRECIPITATION


Algorithms and Products, Retrieved from http://www.nws.noaa.gov/oh/ hrl/ papers/2000mou_pdf/chapter1. pdf.


8. Jayakrishnan, R., Srinivasan, R., & Arnold, J. (2004). Comparison of raingage and WSR88D Stage III pre- cipitation data over the Texas-Gulf basin. Journal of Hydrology, 292(14), 135-152.


9. Klazura, G. E., Thomale, J. M., Kelly, D. S., & Jendrowski, P. (1999). A Comparison of NEXRAD WSR-88D Radar Estimates of Rain Accumulation with Gauge Measurements for High- and Low-Reflectivity Horizontal Gradient Precipitation Events. Journal of Atmospheric and Oceanic Technology, 16(11), 1842-1850.


10. Morin, E., Maddox, R. A., Goodrich, D. C., & Sorooshian, S. (2005). RadarZ– RRelationship for Summer Monsoon Storms in Arizona. Weather and Forecasting, 20(4), 672-679.


11. Seo, D., & Breidenbach, J. P. (2002). Real-Time Correction of Spatially Nonuniform Bias in Radar Rainfall Data Using Rain Gauge Measurements. Journal of Hydrometeorology, 3(2), 93-111.


12. Wilson, J. W., & Brandes, E. A. (1979). Radar Measurement of Rainfall—A Summary. Bulletin of the American Meteorological Society, 60(9), 1048-1058.


13. Seo, B., Dolan, B., Krajewski, W. F., Rutledge, S. A., & Petersen, W. (2015). Comparison of Single- and


Dual-Polarization–Based Rainfall Estimates Using NEXRAD Data for the NASA Iowa Flood Studies Project. Journal of Hydrometeorology,16(4), 1658-1675.


14. Cunha, L. K., Smith, J. A., Baeck, M. L., & Krajewski, W. F. (2013). An Early Performance Evaluation of the NEXRAD Dual-Polarization Radar Rainfall Estimates for Urban Flood Applications. Weather and Forecasting, 28(6), 1478-1497.


15. Seo, B., & Krajewski, W. F. (2010). Scale Dependence of Radar Rainfall Uncertainty: Initial Evaluation of NEXRAD’s New Super-Resolution Data for Hydrologic Applications. Journal of Hydrometeorology, 11(5), 1191-1198.


Slickenside on the Corona Heights Fault


Albert L. Lamarre, CPG-06798


next time any geology student is here, he or she must take the opportunity and time to see what is perhaps the best example of fault slickenlines anywhere in the world!


Given that San Francisco is a popu- lar place for travelers, I suspect that over time many geology students pass through this fine city. I suggest that the


Although not one of the famously known faults of the San Francisco Bay Area, the Corona Heights fault has a slickenside that exhibits one of the best exposures of slickenlines you may ever see! The beautifully exposed fault surface is about 70 meters long by 15 meters high, and it forms a cliff face that was once the wall of a quarry. This expo- sure of world-class slickenlines is devel- oped in Franciscan chert of the Marin Headlands Terrane where the Corona Heights fault, an oblique-dextral fault, cuts through the Castro District south of downtown San Francisco. The fault consists of a thin breccia zone (< 1 meter thick) with an anastomosing network of highly polished grooved slickenlines within the breccia that are profoundly well developed, well exposed, and well preserved. Since the fault cuts radiolar- ian chert of the Franciscan Complex, the fault surface is all silica, which accounts for the high degree of polishing and mirror-like finish. You can almost see yourself in the reflection.


Close-up view of the Corona Heights Fault. 26 TPG • Jan.Feb.Mar 2019


The fault is at 15th and Beaver streets adjacent to the Peixotto Playground and a nursery school on the west side


Corona Heights Fault


of the Castro District in southern San Francisco. It’s easy to miss since build- ings are so closely packed together there and you probably wouldn’t find it if you did not know it is there.


www.aipg.org


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