An earthquake of magnitude 2.7 occurred only 15 minutes ago 4 miles northwest of Rialto, California, United States, the United States Geological Survey reported.The quake hit at a very shallow depth of 3.6 miles beneath the epicenter near Rialto, San Bernardino County, California, USA, in the morning on Thursday, July 31st, 2025, at 8:42 am local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.Our monitoring service identified a second report from The Incorporated Research Institutions for Seismology (IRIS) which listed the quake at magnitude 2.8. A third agency, the European-Mediterranean Seismological Centre (EMSC), reported the same quake at magnitude 2.8.Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Rialto (pop. 103,100) located 4 miles from the epicenter, Fontana (pop. 212,700) 4 miles away, Bloomington (pop. 23,900) 5 miles away, San Bernardino (pop. 216,100) 8 miles away, Colton (pop. 54,600) 8 miles away, and Rancho Cucamonga (pop. 175,200) 11 miles away. In Riverside (pop. 322,400, 13 miles away), Ontario (pop. 171,200, 15 miles away), and Anaheim (pop. 350,700, 36 miles away), the quake was probably not felt.Earthquake data: Date & time: Jul 31, 2025 08:42 am (GMT -7) local time (31 Jul 2025 15:42 GMT)Magnitude: 2.7Depth: 5.75 kmEpicenter latitude / longitude: 34.15°N / 117.42°W (San Bernardino County, California, United States)Primary data source: USGS