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// CODE SNIPPET

3103F.4.2.8 Design Earthquake Magnitude

Los Angeles Building Code > 31F [SLC] Marine Oil Terminals > 3103F Structural Loading Criteria > 3103F.4 Earthquake Loads > 3103F.4.2 Design Earthquake Motion Parameters > 3103F.4.2.8 Design Earthquake Magnitude
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The Design Earthquake Magnitude used in developing site-specific acceleration time histories (Section 3103F.4.2.10) or liquefaction assessment (Section 3106F.4) is obtained using either of the following two methods:

  1. The design earthquake may be selected as the largest earthquake magnitude associated with the critical seismic source. The distance shall be taken as the closest distance from the source to the site. The resulting design earthquake shall be associated with all DPGA values for the site, irrespective of probability levels.
  2. The design earthquake (DEQ) may be obtained for each DPGA or DSA value and associated probability level by determining the corresponding dominant distance and magnitude. These are the values of the distance and magnitude that contribute the most to the mean seismic hazards estimates for the probability of interest. They are usually determined by locating the summits of the 3-D surface of contribution of each small interval of magnitude and distance to the total mean hazards estimate. If this 3-D surface shows several modes with approximate weight of more than 20 percent of the total, several DEQs may be considered, and the DEQ leading to the most conservative design parameters shall be used.

Related Code Sections


3103F.4.2.8 [SLC] Marine Oil Terminals, Design Earthquake Magnitude
The Design Earthquake Magnitude used in developing site-specific acceleration time histories (Section 3103F.4.2.10) or liquefaction assessment ...
Los Angeles Building Code > 31F [SLC] Marine Oil Terminals > 3103F Structural Loading Criteria > 3103F.4 Earthquake Loads > 3103F.4.2 Design Earthquake Motion Parameters > 3103F.4.2.8 Design Earthquake Magnitude
3106F.3 [SLC] Marine Oil Terminals, Seismic Loads for Geotechnical Evaluations
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