Maps for California and Nevada are at USGS - Menlo Park || USGS - Pasadena || SCEC Data Center Maps for Alaska from the Alaska Earthquake Information Center. Maps for the Pacific Northwest from the Pacific Northwest Seismograph Network. Maps for the Intermountain West from the University of Utah Seismograph Stations. Maps for the Central US from the Center for Earthquake Research and Information (CERI) at the University of Memphis.