
Are the following mentions coreferent?:
<m> earthquake </m> in A powerful earthquake centered near The Geysers shook not just communities on Cobb but startled residents in other parts of the county and even in other states. The 4.2-magnitude earthquake was recorded at approximately 9:27 a.m. Sunday, according to the US Geological Survey, which originally had rated the quake as 4.4 in magnitude. At 9:32 p.m., it was followed by a 2.0-magnitude centered quake two miles east of The Geysers and four miles southwest of Cobb, at a depth of two-tenths of a mile. 
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<m> 4 . 6 - magnitude earthquake </m> in A 4. 6 - magnitude earthquake rattled Northern California overnight Thursday, shaking residents from San Francisco to north of Sacramento. The temblor struck at 2 : 09 a.m. and was centered in Geyserville, about 20 miles north of Santa Rosa, according to the U. S. Geological Survey. USGS measurements indicated at least 20 smaller earthquakes followed throughout the morning. 