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2018-04-02_REVISION - M1977342
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2018-04-02_REVISION - M1977342
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Entry Properties
Last modified
1/18/2021 7:10:22 PM
Creation date
4/2/2018 1:40:51 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977342
IBM Index Class Name
Revision
Doc Date
4/2/2018
Doc Name
Adequacy Review Response
From
Climax Molybdenum
To
DRMS
Type & Sequence
TR29
Email Name
PSH
WHE
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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$ECT UTWO SOISMIC Hazard AUNSIS MethalO1091 <br /> 2.2.2 Fault Recurrence <br /> The recurrence relationships for the faults are modeled using the exponentially truncated <br /> Gutenberg-Richter, characteristic earthquake, and the maximum magnitude (or maximum <br /> moment) recurrence models. These models are weighted to represent our judgment on their <br /> applicability to the sources(Figure 4). For the areal source zones and gridded seismicity,only an <br /> exponential recurrence relationship is assumed appropriate. <br /> We have used the general approach of Molnar (1979) and Anderson (1979) to arrive at the <br /> recurrence for the exponentially truncated model. The number of events exceeding a given <br /> magnitude,N(m), for the truncated exponential relationship is <br /> N(m)=a(e) <br /> 10-brm-,W)_10-b(m°-m) <br /> I-10-war-m) (4) <br /> where a(m°) is the annual frequency of occurrence of earthquake greater than the minimum <br /> magnitude, m°; b is the Gutenberg-Richter parameter defining the slope of the recurrence curve; <br /> and m° is the upper-bound magnitude event that can occur on the source. A m°value of M 5.0 <br /> was used for the hazard calculations because smaller events are not considered likely to produce <br /> ground motions with sufficient energy to damage well-designed structures. <br /> We have included the model where faults rupture with a "characteristic" magnitude on specific <br /> segments;this model is described by Aki (1983)and Schwartz and Coppersmith(1984). For the <br /> characteristic model,we have used the numerical model of Youngs and Coppersmith(1985). For <br /> the characteristic model, the number of events exceeding a given magnitude is the sum of the <br /> characteristic events and the non-characteristic events. The characteristic events are distributed <br /> uniformly over±0.25 magnitude unit around the characteristic magnitude and the remainder of <br /> the moment rate is distributed exponentially from a minimum magnitude of M 5.0 to the <br /> characteristic magnitude minus 0.25 unit (or up to the range of the characteristic magnitude) <br /> (Youngs and Coppersmith, 1985). <br /> The maximum magnitude model can be regarded as an extreme version of the characteristic <br /> model. We adopted the model proposed by Wesnousky (1986). In the maximum magnitude <br /> model,there is no exponential portion of the recurrence curve, i.e., no events can occur between <br /> the minimum magnitude of M 5.0 and the distribution about the maximum magnitude. <br /> The recurrence rates for the fault sources are defined by either the slip rate or the average return <br /> time for the maximum or characteristic event and the recurrence b-value. The slip rate is used to <br /> calculate the moment rate on the fault using the following equation defining the seismic moment: <br /> K=µAD (5) <br /> where MO is the seismic moment, µ is the shear modulus,A is the area of the rupture plane, and <br /> D is the slip on the plane. Dividing both sides of the equation by time results in the moment rate <br /> as a function of slip rate: <br /> M. =µ AS (6) <br /> Um 4 <br />
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