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625 Cypress Avenue <br />Geotechnical Investigation <br /> <br />Project No. W1895-88-01 - 5 - April 23, 2024 <br />of movement on the Puente Hills Blind Thrust and the Northridge Thrust, respectively. These thrust <br />faults and others in the greater Los Angeles area are not exposed at the surface and do not present a <br />potential surface fault rupture hazard at the site; however, these deep thrust faults are considered <br />active features capable of generating future earthquakes that could result in moderate to significant <br />ground shaking at the site. <br />6.2 Seismicity <br />As with all of Southern California, the site has experienced historic earthquakes from various regional <br />faults. The seismicity of the region surrounding the site was formulated based on research of an <br />electronic database of earthquake data. The epicenters of recorded earthquakes with magnitudes <br />equal to or greater than 5.0 in the site vicinity are depicted on Figure 5, Regional Seismicity Map. <br />A partial list of moderate to major magnitude earthquakes that have occurred in the Southern California <br />area within the last 100 years is included in the following table. <br />LIST OF HISTORIC EARTHQUAKES <br />Magnitude <br />Long Beach March 10, 1933 6.4 10 SW <br />NW <br />NW <br />Whittier Narrows October 1, 1987 5.9 25 NW <br />NNW <br />ENE <br />ENE <br />Northridge January 17, 1994 6.7 50 NW <br />ENE <br />N <br />The site could be subjected to strong ground shaking in the event of an earthquake. However, this <br />hazard is common in Southern California and the effects of ground shaking can be minimized if the <br />proposed structures are designed and constructed in conformance with current building codes and <br />engineering practices. <br /> <br />