Earthquake Report: Minor Seismic Activity Recorded Near Cobb, California
Data shows the tremor registered an intensity level of not noticeable across dozens of surrounding communities in Lake, Sonoma, Napa, Mendocino, Solano, Yolo, Marin, and Contra Costa counties. Ground Motion Recorded Across Multiple Northern regions followed minor seismic activity originating from an epicenter near Cobb, California.
Seismic Intensity and Distance from Epicenter
The magnitude 1.5 seismic event occurred with its epicenter positioned near Cobb, which has a population of 1,780. Recorded data indicates that the tremor produced no noticeable shaking across any of the monitored surrounding localities. Communities situated at varying distances from the epicenter registered the intensity level identically as not noticeable.
Among the cataloged locations in Lake County, Kelseyville, with a population of 3,350, sits 17 kilometers north of the epicenter. Clearlake, holding a population of 15,200, and Hidden Valley Lake, with 5,580 residents, are both located 21 kilometers from the epicenter. Further north, North Lakeport is positioned 31 kilometers away. Additional measurements detail locations further outward, including Cloverdale in Sonoma County at 19 kilometers west of the epicenter, and Healdsburg at 25 kilometers south.
Regional Impact Across Multiple California Counties
The reach of the recorded ground motion extended across numerous population centers throughout Northern California without generating any perceptible disruption for residents. In Sonoma County, populated areas such as Windsor, Guerneville, Santa Rosa—housing a population of 178,100—Sebastopol, Occidental, Rohnert Park, Agua Caliente, Sonoma, and Petaluma all registered the event as not noticeable. Similar non-perceptible intensity levels were documented further south and east in Napa County, including Calistoga, St. Helena, and American Canyon.
Readings from Mendocino County noted the same status in Ukiah. Across Solano County, communities encompassing Vacaville, Fairfield, Suisun, Vallejo, Dixon, and Benicia registered no perceptible movement. Yolo County locations, including Woodland and Davis, as well as Marin County areas such as San Anselmo and San Rafael, recorded identical non-noted intensities. Finally, municipalities within Contra Costa County—consisting of San Pablo, Richmond, Martinez, Concord, Pleasant Hill, Pittsburg, Antioch, and Brentwood—completed the wide distribution zone where the magnitude 1.5 activity remained entirely unnoticeable.
Past Tremors Recorded Across the Red Sea Region
Additional seismic events recorded in broader regional tracking include a magnitude 4.9 tremor on 6 September 1987 at 11:05 (GMT +2) at a depth of 10 km, located 66 km southeast of the Red Sea and 78 km southwest of Duba in the Tabuk Province of Saudi Arabia. Another tracking record notes an unconfirmed magnitude 1.5 event on 14 October at 14:52 (GMT +3) at a depth of 13 km, positioned 37 km north of the Red Sea and 34 km south of Sharm el-Sheikh in South Sinai, Egypt. An earthquake registered on 16 June 2020 at 16:30 (GMT +2) with a magnitude of 5.2 and a depth of 10 km, located 31 km east and 78 km east of Jiftun as-Saghir in the Red Sea, Egypt, drawing 131 reports.