The Mark at Eugene January 6, 2026 <br />Seismic Hazard Study 8 Project No.: 2251077 <br />Eugene, Oregon Landmark Construction, LLC <br />1962 (Wong and Bott, 1995). According to Wong and Bott (1995), seismograph <br />stations sensitive to smaller earthquakes (ML ≤4 to 5) were not implemented in <br />northwestern Oregon until 1979 when the University of Washington expanded their <br />seismograph network to Oregon. The local Richter magnitude (ML) of events occurring <br />prior to the establishment of seismograph stations have been estimated based on <br />correlations between magnitude and MMI. Some discrepancy exists in the correlations. <br />Table 3D summarizes distant, strong earthquakes felt in the Eugene area (Bott and <br />Wong, 1993; Stover and Coffman, 1993; Wiley et al., 1993; Dewey et al., 1994; <br />Wong and Bott, 1995; Black, 1996; Dewey et al., 2002). None of these events caused <br />significant, reportable damage in Eugene or the surrounding area. <br />Table 3 D. Distant Earthquakes Felt in the Eugene Area <br />Earthquake Modified Mercalli Intensities <br />(MMI) <br />2001 Nisqually, Washington II to III <br />1993 Klamath Falls, Oregon IV <br />1993 Scotts Mills, Oregon IV <br />1965 Seattle – Tacoma, Washington I to IV <br />1962 Portland, Oregon I to IV <br />1961 Lebanon/Albany, Oregon IV <br />1949 Olympia, Washington IV <br />1873 Crescent City, California V <br />Seismic and Geologic Hazards <br />Section 1803.6.1 of the 2022 OSSC requires the evaluation of risks from a range of <br />seismic hazards including landslides, earthquake-induced landslides, liquefaction and <br />lateral spread, seismic-induced settlement or subsidence, fault rupture, <br />earthquake-induced flooding and inundation, and local ground motion amplification <br />(OSSC, 2022). The building is a high occupancy facility and is considered within Risk <br />Category III per the 2022 OSSC. <br />We have developed conclusions regarding the seismic hazards based on the subsurface <br />profiles encountered in our explorations at the project site. The conclusions are also <br />based on our knowledge of the site geology, a review of previous geotechnical and <br />seismic studies performed in the vicinity, and available geologic hazard maps (including <br />information available from DOGAMI). <br />