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In seismology, the depth of focus or focal depth is the depth at which an earthquake occurs. Earthquakes occurring at a depth of less than 70 km (43 mi) are classified as shallow-focus earthquakes, while those with a focal depth between 70 km (43 mi) and 300 km (190 mi) are commonly termed mid-focus or intermediate-depth earthquakes. [1]
The strongest deep-focus earthquake in seismic record was the magnitude 8.3 Okhotsk Sea earthquake that occurred at a depth of 609 km (378 mi) in 2013. [22] The deepest earthquake ever recorded was a small 4.2 earthquake in Vanuatu at a depth of 735.8 km (457.2 mi) in 2004. [23]
The earthquake was the largest in China since the Maduo earthquake in May 2021 and the deadliest since the Jishishan earthquake in December 2023. [ 5 ] [ 6 ] It was caused by normal faulting and originated within the continental crust at 10 km (6.2 mi) depth.
This is why an earthquake's depth is often given. The epicenter of the Northridge earthquake in Los Angeles in 1994 was in the San Fernando Valley, the point where the quake was strongest.
Earthquakes occurring at a depth of less than 70 km (43 mi) are classified as "shallow-focus" earthquakes, while those with a focal depth between 70 and 300 km (43 and 186 mi) are commonly termed "mid-focus" or "intermediate-depth" earthquakes.
Earthquake magnitudes are based on data from the USGS. Compared to other years. Number of earthquakes worldwide for 2015–2025 ... Depth (km) Date Event 1
Hypocenter (Focus) and epicenter of an earthquake. An earthquake's hypocenter or focus is the position where the strain energy stored in the rock is first released, marking the point where the fault begins to rupture. [3] This occurs directly beneath the epicenter, at a distance known as the hypocentral depth or focal depth. [3]
The 7.1-magnitude quake struck at 9:05 a.m. local time at a depth of 10 kilometers (6.2 miles) and was followed by multiple aftershocks, according to the United States Geological Survey (USGS).