Ruptures of deep-focus earthquakes in the north-western Pacific and their implications on seismogenesis

Glennon, Mary Ann; Chen, Wang‐Ping

doi:10.1111/j.1365-246x.1995.tb01847.x

Cited by 14 publications

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This hypothesized vertical tear is associated with rotated focal mechanisms and a fold in the slab geometry [ Myhill , ]. Several deep‐focus earthquakes also ruptured along subhorizontal planes [ Kuge , ; Glennon and Chen , ; Chen et al , ; Antolik et al , ; Tibi et al , ; Chen and Wen , ]. However, an M W 6.7 aftershock of the previously mentioned 24 May 2013 Sea of Okhotsk earthquake may have slipped on a vertical plane [ Zhan et al , ].…”

Section: Introductionmentioning

confidence: 99%

“…While earthquake focal mechanisms indicate the general orientations of stresses acting on the slab, we can infer more about slab deformation by distinguishing which of the two possible fault planes slipped during an earthquake. Methods to distinguish which of the two possible fault planes slipped include modeling Kuge [1994] and Glennon and Chen [1995] Takeo et al [1993] and Ide and Takeo [1996] 259 ∘ 86 ∘ −95 ∘ Suzuki and Kasahara [1996] Chen et al [1996] and Antolik et al [1999] Tanioka et al [1995], Katsumata et al [1995] 50 ∘ 74 ∘ 128 ∘ and Kikuchi and Kanamori [1995] Wei et al [2013] and Ye et al [2013], 12 ∘ 79 ∘ −89 ∘ Meng et al [2014] and Zhan et al [2014b], Chen et al [2014] and Chen and Wen [2015] I 2013/05/24 1456:34.9 52.36 151.48 642.4 6.7 231 ∘ 28 ∘ −67 ∘ Zhan et al [2014a] 25 ∘ 64 ∘ −102 ∘ of rupture propagation and/or slip distribution for the earthquake or, if aftershocks occur, through their relocation. Many of these methods were used to study the 24 May 2013 Sea of Okhotsk earthquake (M W 8.3, 611 km depth) and obtain high-resolution spatial and temporal details of the rupture process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fault plane orientations of intermediate‐depth and deep‐focus earthquakes in the Japan‐Kuril‐Kamchatka subduction zone

et al. 2015

View full text Add to dashboard Cite

In the northwestern Pacific, the Pacific plate subducts to the west at the Japan, Kuril, and Kamchatka trenches. Throughout most of the subduction zone, the subducting slab is planar and dipping at an angle of 30°–60°, with the exception of a fold in the southern Kuril segment. To investigate how the slab deforms in response to the applied forces and which mechanism generates the earthquakes, we analyze the rupture properties of 111 large (MW≥5.7) intermediate‐depth and deep‐focus earthquakes (60–656 km depth) from 1990 to 2014 in the Japan‐Kuril‐Kamchatka subduction zone. For each earthquake, we use rupture directivity to estimate rupture direction and rupture speed and to distinguish the fault plane from the auxiliary plane of the focal mechanism. Seventy six percent of the earthquakes with sufficient station coverage are well modeled by unilateral rupture propagation. The estimated rupture speeds range from zero to supershear. The estimated rupture directions allow identification of the fault plane as the more horizontal nodal plane for 30 earthquakes, while an additional 11 earthquakes rupture toward the intersection of the nodal planes, so the fault plane cannot be identified. Combining our newly identified fault planes with previously identified fault planes in the region, we observe that in planar slab segments, most earthquakes slip along a dominant fault orientation. For a steeply dipping slab, this orientation is subhorizontal. In more sharply bent slab segments, such as the Kuril fold, deformation is accommodated along more variable fault orientations, including subvertical faults. The correlation of slab geometry with fault orientation suggests that the local stress field controls fault orientations.

show abstract