Joseph Augustus Lott, born March 10, 1855, was one of nine children of John Smiley Lott and his two wives, Mary Ann Faucett and Docia Emmerine Molen. John Lott was a soldier and settler for the Mormon Church. The Lott cabin, built by John in the mid-1870's, is located in Clear Creek Canyon just east of the mouth of Mill Creek and is typical of pioneer dwellings during Utah's territorial period. The homestead is significant because of its location on the Old Spanish Trail, which was a major trade route in Utah. The cabin was surrounded by cottonwoods and a variety of fruit trees. The Lett's economic survival depended on the production of grains, vegetables, fruit, and stock for home consumption. Joseph Lott married Marua Twitchell on May 18, 1878, and had four daughters and six sons. They settled in Clear Creek Canyon and farmed. In addition, Joe drove a wagon train up to the miners at the gold and silver mines at Kimberly, TVz mi south-southwest of the Lott homestead, delivering mail and supplies. The trail and the adjacent creek were named after Joe Lott, and eventually the rocks forming the canyon walls of Joe Lott Creek and lower Clear Creek became formally named the Joe Lott Tuff Member of the Mount Belknap Volcanics.
Instrumental seismicity defines a seismic gap along the Rodgers Creek fault zone (RCFZ) between Santa Rosa and San Pablo Bay. Results of a paleoseismicity study within the gap, using offset channels in late Holocene alluvial deposits as piercing points, indicate a minimum slip rate of 2.1 to 5.8 mm/yr for the past 1300 years, a preferred range for the maximum recurrence interval of 248 to 679 years, and a surface offset of 2 +0.3, −0.2 m during the most recent event. The RCFZ has produced past M7 earthquakes, and historical seismicity data indicate a minimum elapsed time of 182 years since the most recent earthquake of this size.
FIGURE 1. Index map showing the location of the SHFZ and the two epicenters of the November 1987 earthquakes. Surface rupture along the SHFZ and the northeasttrending faults are shown schematically (from Sharp et al 1989). FLOW CHART field notes for lip measurements slip data files 'SITE'.DAT S J N prior parameter files 'SITE'.OUT slip parameter files 'SITE'.OUT 1 plots of data and model fits for slip sites intermediate parameter tables 'GROUP'.TBL 'SITE'R.TBL TABLE 1. Format of the 'SITE'.DAT file, shown by NQUAD.DAT, required by the QUAD3D program.
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