Tectonic Summary (October 26th 2015)
7.5 earthquake below
the Hindu Kush Range:
result of reverse faulting.
Focal mechanisms indicate rupture:
either a near-vertical reverse fault
or a shallowly dipping thrust fault.
Collision causes uplift:
direct result of convergence
between India and Eurasia plates.
Intermediate quakes (depth 70 to 300 km):
2002 landslides caused 150 fatalities,
destruction of over 400 houses.
Seismicity in the hazardous Himalaya:
continental collision converging,
relative rate of 40-50 mm/yr.
Yarlung-Zangbo Suture (to the north)
and Main Frontal Thrust (to the south):
This region has the highest rates of seismicity
The largest recorded Himalaya earthquake:
15th August 1950 in Assam, strike-slip,
widely felt in central Asia, extensive damage.
Collective faults, crustal shortening, ongoing
collision, thrust faults, north south compression,
normal and strike-slip, east-west extension.
The active, left-lateral, strike-slip Chaman fault:
fastest moving in the region. In 1505, a segment
near Kabul ruptured: widespread destruction.
Shallow crustal earthquakes also occur
near the Main Pamir Thrust and other
active Quaternary faults.
Also within the Indo-Burmese Arc:
combination of strike-slip and reverse faults;
Sagaing, Kabaw and Dauki.