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The Hjort Trench is a linear topographic depression south of Macquarie Island in the southwest Pacific Ocean.  Geologically, the depression is considered to be the seafloor expression of an ocean-ocean  subduction zone, where the Australian plate is thrusting beneath the Pacific Plate. As the southernmost portion of the Macquarie Ridge Complex, the Hjort Trench lies in an area of diagonal convergence produced by the transform fault evolution of the  Emerald Fracture Zone. Frequent seismic events, most less than 20 km deep, characterize the transpression along this plate boundary. 
The deepest point of Hjort trench is approximately 6.3 km below sea level. To the east, the Hjort ridge follows the general curve of the trench, separating the trench from the Hjort Plateau.
The Hjort trench lies in an area of transpression where the plate boundary transitions from a transform boundary to a convergent one. As such, this region provides an example of how a transform boundary with a vertical or near-vertical transform fault becomes an area of under-thrusting.
Cazenave, Anny; Ruff, Larry (1985). "SEASAT geoid anomalies and the Macquarie Ridge complex ". agris.fao.org. Food and Agriculture Organization of the United Nations.
"Seafloor Mapping of the South-east Region and Adjacent Waters : AUSTREA-2 Cruise Report: South-east of Tasmania and Southern Macquarie Ridge". data.gov.au. Government of Australia.
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Meckel, T.A.; Coffin, M.F.; Mosher, S; Symonds, P; Bernardel, G; Mann, P (6 December 2003). "Underthrusting at the Hjort Trench, Australian-Pacific plate boundary: Incipient subduction?". Geochemistry, Geophysics, Geosystems. 4 (12): 1099. Bibcode: 2003GGG.....4.1099M. doi: 10.1029/2002GC000498.
^ Lodolo, E. and F. Coren (1994). "The Westernmost Pacific Antarctic plate boundary in the vicinity of the Macquarie triple junction." (In C.A. Ricci, ed. Terra Antarctica, vol.1). pp. 158-161
Meckel, T. A.; Coffin, M. F.; Mosher, S.; Mann, P.; Symonds, P.; Bernardel, G. (2002). "Underthrusting at the Hjort Trench, Australia-Pacific Plate Boundary: Incipient Subduction?". AGU Fall Meeting Abstracts. 2002: T52A-1177. Bibcode: 2002AGUFM.T52A1177M.
"Hjort Trench: Undersea Features". geographic.org. Geographical Names.