Maybe Some Big Ground Shakes One Hundred Years Ago in a Big State Near the Ocean Were Caused by People

Susan Elizabeth Hough1, Victor C Tsai2, Robert Walker3, Morgan T Page1 and Fred Aminzadeh4, (1)USGS Pasadena Field Office, Pasadena, CA, United States, (2)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (3)University of Southern California, Petroleum Engineering, Los Angeles, CA, United States, (4)University of Houston, Houston, TX, United States