How deep below the surface do Hindu Kush earthquakes begin?

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The Hindu Kush and the Pamirs constitute the most seismically active intermediate-depth earthquake zone in the world. Earthquakes in this region originate between 100 and 140 miles (160 and 230 km) below the surface within a 25-mile (40-km) wide belt.1

While most earthquakes globally are shallow—originating within 60 km (40 miles) of the surface—the Hindu Kush is a notable exception to typical patterns of seismic activity.2