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21 ATTACHMENT 3
City of Pleasanton
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CITY CLERK
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AGENDA PACKETS
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2021
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072021
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21 ATTACHMENT 3
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7/15/2021 2:13:11 PM
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CITY CLERK
CITY CLERK - TYPE
AGENDA REPORT
DOCUMENT DATE
7/20/2021
DESTRUCT DATE
15Y
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<br />79 <br />Livermore. Because of the high level of seismic activity in and around Livermore, <br />the area has been classified as seismic risk Zone 4 by the California Building Code, which <br />is the highest risk category. The Greenville Fault, an active fault that is the easternmost <br />strand of the San Andreas fault system in the San Francisco Bay region, is located <br />approximately four miles to the east of downtown Livermore. Each of the three segments <br />of the Greenville Fault is considered capable of generating earthquakes in the range of <br />Richter magnitude 6.6 to 6.9. If all segments were to rupture in a single seismic event, a <br />7.2 magnitude earthquake would be expected. The United States Geologic Survey <br />estimates a 6% probability of a 6.7 magnitude or greater earthquake on the Greenville <br />Fault during the period 2000 to 2030. <br /> <br />The Las Positas Fault, which is considered to be active, is located approximately <br />2.5 miles to the southeast of downtown Livermore. The Las Positas Fault could potentially <br />generate an earthquake of Richter magnitude 6.3. <br /> <br />In addition, several other major active faults are located in the vicinity of Livermore, <br />including the Calaveras and Hayward faults. In addition, the Livermore Fault is considered <br />to be potentially active and capable of generating an earthquake with moment magnitude <br />of 6.2. <br /> <br />Finally, there is a structural trend of folds and thrust faults in the hills north of <br />Livermore, the largest of which is the Mount Diablo anticline; the Mount Diablo anticline <br />presents the potential for an earthquake with a magnitude of 6.7 with a 4% probability of <br />occurring during the period 2000 to 2030. An earthquake on the fault would not be <br />expected to cause fault rupture at the surface. However, strong ground shaking would be <br />expected within the Livermore area during such an earthquake. <br /> <br />Pleasanton. The active faults in or near Pleasanton include the Calaveras, <br />Concord-Green Valley, Greenville, Hayward, Mt. Diablo Thrust, and San Andreas Faults. <br />The Calaveras and Verona Faults are the only faults within the Planning Area that the <br />State currently designates as Alquist-Priolo Earthquake Fault Zones. <br /> <br />DSRSD. <br /> <br />City of Dublin: According to the Seismic Safety and Safety Element of the <br />City of Dublin’s General Plan, the Calaveras Fault is the major active fault in the <br />Dublin planning area. The Pleasanton Fault, near the west edge of Camp Parks, <br />is difficult to locate precisely. The State has established Alquist-Priolo Special <br />Studies Zones along both faults, requiring detailed studies of rupture hazards prior <br />to construction. Few potential building sites within the City of Dublin or the <br />extended planning area are without geologic impact or hazard. The hazard may <br />be actual, such as an active landslide or proximity to an active fault, or potential, <br />such as a proposed cut that might activate a landslide. <br /> <br />City of San Ramon: According to the Safety Element of the City of San <br />Ramon’s General Plan 2020, the major active fault with rupture potential is the <br />Calaveras Fault. The California Legislature has established an Alquist-Priolo <br />Earthquake Fault Zone along the fault, requiring detailed studies of rupture <br />hazards prior to construction. Two smaller faults, the Dublin Fault and the Bollinger <br />Fault, also traverse portions of the City and its Sphere of Influence. While these <br />faults are not regarded as active, evidence is inconclusive. Minor, presumed
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