We examined the source characteristics of the 1994 deep earthquakes of Bolivia (June 9) and Fiji (March 9) over a period range of 1--1000 s using moment tensor and body wave analyses. Moment tensor inversions from 100--1000 s reveal that these two earthquakes were essentially point sources at very long period with insignificant isotropic and non-double couple components with scalar moments M0=2.56¿1021 Nm for the Bolivia and M0=0.26¿1021 Nm for the Fiji earthquakes. Body wave analysis for the Bolivia event reveals a 45 s duration, a nearly linear E--NE 1 km/s rupture on the subhorizontal focal mechanism plane giving a stress drop Δ&sgr;=114 MPa. For the Fiji earthquake we find a change in focal mechanism and a linear 3 km/s rupture plunging shallowly to the north on the steep dipping nodal plane with a duration of at least 20 s and Δ&sgr;=14 MPa. Both ruptures propagated parallel their null (&sgr;2) axis and suggests that their width is controlled by the thickness of the seismogenic volume in deep slabs. ¿ American Geophysical Union 1995