Foundation, Concrete and Earthquake Engineering

Tectonic Cause of Magnitude 7.0 Earthquake of MOZAMBIQUE 2006 February 22

Magnitude 7.0 Earthquake of MOZAMBIQUE, 2006/02/22 was Felt throughout Mozambique and eastern Zimbabwe. Felt in Swaziland and at Lobatse, Botswana and Lusaka, Zambia. Its intensity can be expressed as:

Felt (V) at Beira, Inhambane and Maputo; (IV) at Matola. Felt (IV) at Harare and Mutare, Zimbabwe. Also felt (IV) at Louis Trichardt and Phalaborwa; (III) at Durban and Middelburg; (II) at Johannesburg and Pretoria, South Africa. 

Seismic Details:

Magnitude: 7.0

Date-Time : Wednesday, February 22, 2006 at 22:19:07 UTC
Thursday, February 23, 2006 at 12:19:07 AM at epicenter
Location : 21.259°S, 33.480°E
Depth :  11 km (6.8 miles) set by location program


Parameters : NST=243, Nph=243, Dmin=866.2 km, Rmss=1.31 sec, Gp= 22°, M-type=teleseismic moment magnitude (Mw), Version=S
The earthquake occurred near the southern end of the East African rift system. The East African rift system is a diffuse zone of crustal extension that passes through eastern Africa from Djibouti and Eritrea on the north to Malawi and Mozambique on the south and that constitutes the boundary between the Africa plate on the west and the Somalia plate on the east. At the earthquake's latitude, the Africa and Somalia plates are spreading apart at a rate of several millimeters per year. The largest earthquake to have occurred in the rift system since 1900 had a magnitude of about 7.6. Most earthquakes within the East African rift system occur as the result of either normal faulting or strike-slip faulting.

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