Documents

One of the fastest growing areas of Arizona is the eastern part of the Phoenix Basin near the communities of Chandler, Gilbert, Mesa, and Apache Junction. Much of this development has occurred on the piedmont near the base of the mountains where little of the surficial geology has ever been mapped. Because this area of the Phoenix Basin will continue to grow in the future, there is a need to understand the nature and distribution of surficial deposits.

Recommendations for seismic design ground motions for nuclear facilities require a consistency with both observed strong motion data and with seismological theory on the characteristics of strong shaking. Different recommendations are appropriate for various regions of the US, because both earthquake source characteristics differ and the earth's crustal properties vary with region.

Changes since 1855 in reported section-line lengths and positions of survey monuments that span the San Andreas fault (SAF) were used to measure displacement interpreted to be from the 1857 Fort Tejon earthquake in south-central California. In 1855–1856 James E. Freeman established township and range lines across the SAF between Rancho Cholame and the northern Carrizo Plain. At least 26 1-mile sections lines spanned the SAF in the area between present-day California Highways 46 and 58. Each section line was marked by monuments at the midpoint and endpoints.

This report presents the results of probabilistic seismic hazard analyses for use in screening/scoping-level dam safety and/or risk assessments of Granite Reef Diversion and Theodore Roosevelt Dams in southern Arizona. The purpose of these evaluations is to estimate the levels of ground motions, which will be exceeded at specified annual frequencies (or return periods), at the damsites.

The moment magnitude (M_w) 7.9 Fort Tejon earthquake of 1857, with a ~350-kilometer-long surface rupture, was the most recent major earthquake along the south-central San Andreas Fault, California. Based on previous measurements of its surface slip distribution, rupture along the ~60-kilometer-long Carrizo segment was thought to control the recurrence of 1857-like earthquakes.

The principal objective of this report is to present and review groundwater level and hydraulic head data for the RC hydrologic monitoring network.

Arizona - Reserving lands within national forests for use of the Forest Service as campgrounds, recreation areas, or for other public purposes

This report provides the results of a noise monitoring study conducted at the West Plant of the Resolution Copper Mining LLC (RCM) in Superior, Arizona. The study documented the noise levels for a continuous monitoring period from May 7, 2015 through May 15, 2015. The purpose of this study was to document the existing noise levels at three locations along the RCM West Plant’s southern property boundary line which lies adjacent to a residential community.

Map and game species overview of Unit 37B.

A literature review was completed to summarize current information regarding the characteristics and potential performance of Gila Conglomerate as a capping material and plant growth medium.