Ninyo & Moore Geotechnical and Environmental Sciences Consultants.

Ninyo & Moore provides geotechnical engineering, engineering geology, geophysics, hydrogeology, soil and materials testing, and environmental services.
3202 East Harbour Drive Phoenix, AZ
Phone: 602.243.1600

Engineering Geology

Ninyo & Moore's experienced and licensed professional staff of geologists, engineering geologists, and hydrogeologists can evaluate and address potential geologic and seismic hazards that affect your projects.

Our in-house personnel are experts in the areas of:

  • Earthquake and fault studies
  • Earthwork and grading
  • Feasibility studies
  • Geologic hazard evaluations
  • Hydrogeologic studies
  • Landslide evaluations
  • Seismic hazard assessments

Earthquake and Fault Studies

The assessment of earthquake hazards is a common challenge in engineering geology tasks at Ninyo & Moore. Earthquake hazard studies are included in the planning, environmental impact, design, construction, and forensic phases of projects. Ninyo & Moore maintains current research data and analytical techniques to assess faulting and earthquake hazards for our clients including:

  • Fault location studies to evaluate the presence of active faulting and fault rupture potential
  • Fault trenching and age dating to evaluate fault activity and fault recurrence intervals
  • Deterministic and probabilistic seismic hazard analysis to evaluate potential earthquake magnitudes and anticipated ground accelerations
  • Secondary earthquake hazards including liquefaction, lateral spreading, landsliding, tsunamis and seiches, ground lurching, and dynamic settlement
  • Site response spectra analysis
  • Seismic design coefficients

Feasibility Studies

Engineering geology plays an important role in feasibility studies for planning phases of land development, building construction, transportation projects, environmental mitigation, and other land use studies. Engineering geology feasibility studies are often preliminary evaluations involving research and review of published geologic maps, fault and seismic hazard data, and field geologic mapping. Subsurface exploration may also be involved in some feasibility studies.

Feasibility studies may provide early assessment of potential geologic conditions that may have significant impacts to a project including:

  • Earthquake fault zone hazards
  • Seismic hazard zones
  • Landslides, geologic structure, and slope stability
  • Earthwork and grading constraints
  • Groundwater

Geologic Hazard Evaluations

Geologic hazard evaluations are incorporated into geologic studies and may also be performed as a site-specific objective. Geologic hazard evaluations range from preliminary assessments to detailed analysis of hazards and design of mitigation measures.

Geologic hazard evaluations address:

  • Faulting and seismic hazards, including ground shaking, ground rupture, and liquefaction potential
  • Landslide, mudflow, and rockfall potential
  • Groundwater conditions and potential for flooding
  • Erosion potential
  • Compressible peat and organic soil deposits
  • Expansive soils

Hydrogeologic Studies

Evaluation of the groundwater regime in the subsurface geologic environment can be a significant aspect of the planning, design, development, or construction of a project. Ninyo & Moore provides hydrogeologic studies to assist private developers, public agencies, contractors, and engineering firms.

Our hydrogeologic studies include:

  • Evaluation of depths to groundwater, groundwater transport, and flow rates
  • Installation of monitoring wells and piezometers, and pore pressure measurements
  • Aquifer drawdown pump testing and evaluation of hydraulic conductivity, storage capacity, and transmissivity
  • Groundwater resource potential studies
  • Construction dewatering
  • Mitigation of groundwater hazards

Landslide Evaluations

Landslides, including rock falls, rotational slumps, translational block slides, debris flows, and complex earth movement, can cause extensive damage. Landslide evaluations are performed by our engineering geologists and geotechnical engineers to evaluate existing or potential landslides for planning and design considerations and to develop stabilization techniques.

Landslide evaluations involve:

  • Review of topographic maps and stereoscopic aerial photographs
  • Geologic mapping and field documentation of landslide features such as ground cracking, headscarps, grabens, pressure ridges, joints and fractures, and seepage
  • Subsurface exploration to evaluate landslide geometry, material types, and rupture surfaces
  • Installation, monitoring, and analysis of slope inclinometers
  • Geologic modeling to perform slope stability analysis
  • Landslide and slope stabilization design measures, including earth buttresses, shear pins, rock bolting, in-situ soil improvement, and dewatering
  • Construction monitoring and geologic evaluation during landslide stabilization