GEOSCIENCES


D’Appolonia offers many services in the geosciences area. Included among these are studies of regional and local geology and site geological characterization; geohazard assessment including development of design-basis earthquakes and assessment of the risk of tsunamis; vibration monitoring including machinery foundations and blast effects; rock mechanics and the development of plans for excavation and blasting of rock; and application of remote sensing technologies to practical purposes such as identification of tree canopy stress, evaluation of urbanization on land use, assessment of water quality in rivers and large water bodies.


Some examples of our geosciences experience include the following:

  • GEOHAZARD ASSESSMENT
  • BLASTING PLANS/BLAST AND
    VIBRATION MONITORING
  • REMOTE SENSING ANALYSIS

Brief descriptions of our capabilities in the areas listed above are provided in the following paragraphs. More detailed discussions of individual topics can be accessed by clicking on the links provided.



Geohazard Assessment

D’Appolonia provides consulting services related to the evaluation of earthquakes and earthquake engineering including:

  • Seismic hazard assessments
  • Surface faulting
  • Soil and rock dynamics
  • Soil-structure interaction
  • Earthquake resistant design

For more than three decades D’Appolonia has evaluated earthquake hazards and provided earthquake engineering services on projects throughout the United States, in Europe and in Latin America for industries, government organizations, contractors, A/E firms, and commercial enterprises. Most of these studies have related to seismic design of major engineering projects, including power plants, dams, offshore structures and pipelines. In terms of one class of facility alone - fixed offshore structures - D'Appolonia has evaluated seismic design criteria for more than 40 sites around the world.



Blasting Plans/Blast and Vibration Monitoring

D’Appolonia has been involved with many construction projects where rock excavation is required to achieve desired site elevations or to stabilize a slope. These projects typically involve geologic site characterizations and rock mechanics studies to identify suitable techniques for excavation. We are experienced in the preparation of blasting plans for removal of rock and in monitoring the effects of blasting using seismograph instrumentation. We have also used this instrumentation for monitoring vibrations associated with the operation of industrial machinery.



Remote Sensing Analysis

Remote sensing is the collection of data through aerial-mounted or satellite instrumentation. There are two basic types of remote sensors: passive and active. Passive sensors are the most common and generally record reflected light or radiation from the target. Parameters sensed include the visible light spectrum, infrared light, radiation, and temperature. An example of active sensing is LIDAR, which involves transmission of radar waves and measurement of the reflection from the target. Remote sensing has many applications. Included among these are classification of surface cover and land use, evaluation of vegetation/tree canopy health, agricultural practices, and water quality. These data are typically input to GIS software and used for purposes such as estimating land use changes/urbanization, evaluating coastal shoreline changes, identifying the presence of contaminants in water bodies, and managing natural resources. D'Appolonia is experienced in the interpretation of aerial and satellite data for such uses.


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