He ōlaʻi ikaika he 7.5 i hana ʻia i ka pō Pōʻakolu 185 mile ma ka hema o Loyalty Islands. ma ka hola 6.08 pm ka manawa kūloko, Dekemaba 5.
Ua hoʻopuka nā luna kūloko ma Vanuatu i kahi ʻōlelo aʻo e pili ana i ke kai eʻe, akā e like me ka USGS ma Hawaii, ʻaʻohe ʻōlelo aʻo i kau ʻia no ka Moana Pākīpika me Guam a me Hawaii.
Location:
- 168.2 km (104.3 mi) ESE o Tadine, New Caledonia
- 254.4 km (157.7 mi) ESE o W New Caledonia
- 298.9 km (185.3 mi) Hikina o Mont-Dore, New Caledonia
- 309.9 km (192.2 mi) Hikina o Dumba, New Caledonia
- 311.1 km (192.9 mi) Hikina o Noumea, New Caledonia
ʻO Kekemapa 5, 2018, M 7.5 ma ka hikina o New Caledonia ma ke komohana hema o ka Moana Pākīpika i hana ʻia ma muli o ka haʻihaʻi maʻamau maʻamau i loko o ka ʻāʻī moana o ka pā Australia, ma ke komohana o ka South New Hebrides Trench e hōʻailona ana i ka palena pā ma waena o ka ʻO Australia a me ka Pākīpika ma kēia māhele. Hōʻike nā haʻina hana hoʻopololei i ka hāʻule ʻana o ka hewa ma ke komohana ʻākau a i ʻole ka hikina hema. Ma kahi o kēia ōlaʻi, neʻe ka pā Australia i ka hikina-akau hikina e pili ana i ka Pākīpika ma kahi o 78 mm/yr. Ma ka South New Hebrides Trench, hui ka lithosphere o Australia me ka pohō ma lalo o ka pā Pakipika, e iho ana i loko o ka ʻaʻahu a hoʻokumu i ka New Hebrides/Vanuatu subduction zone, e hohola ana mai New Caledonia ma ka hema a i nā mokupuni ʻo Santa Cruz ma ka ʻākau, kahi mamao. ma kahi o 1,600 km. ʻO ka lā 5 o Dekemaba, 2018, ua kokoke loa ke ōlaʻi i kēia ʻauwaha, a ma kona komohana, ma ka ʻāina tectonic i kapa ʻia i kekahi manawa ʻo ka "outer rise" kahi e hoʻomaka ai ka hoʻololi ʻana o ka pā subducting ma mua o ke komo ʻana i loko o ke kapa. ʻO ka wahi, ka hohonu, a me ka hoʻonā ʻana o kēia ōlaʻi ua kūlike me ka hanana i hana ʻia ma muli o ka hewa intraplate ma kēia ʻāina piʻi i waho.
ʻOiai e noʻonoʻo mau ʻia ana ma ke ʻano he kiko ma nā palapala ʻāina, ʻoi aku ka maikaʻi o ka wehewehe ʻana i nā ʻōlaʻi o kēia nui ma ke ʻano he paheʻe ma luna o kahi hapa nui. ʻO nā hanana hewa maʻamau o ka nui o ka ōlaʻi ʻo Dekemaba 5, 2018 ma kahi o 75×30 km ka nui (lōʻihi x laula).
ʻO ka ōlaʻi ʻo Dekemaba 5, 2018 ke ono o ke olai M 6+ e kū mai ana ma kēia ʻāina i nā mahina ʻekolu i hala iho nei, a he ʻāpana ia o ke kaʻina hana o nā hanana i hoʻomaka ma ʻAukake 29th, 2018 me kahi ōlaʻi M 7.1 interplate thrust faulting i ka hikina. o ka South New Hebrides Trench a ma kahi o 70 km i ka hikina o ke ōlaʻi o Dekemaba 5, 2018. I loko o kēia manawa, ma kahi o 140 M 4+ mau ʻōlaʻi i hoʻopaʻa ʻia ma kēia māhele e ka USGS, ʻo ka hapa nui o nā ʻōlaʻi hewa i ka hikina o ka palena pā. Ma mua o ka ōlaʻi o kēia lā he 4 mau minuke e ka M 6.8 foreshock, ma kahi o 13 km ma ke komohana o ka ʻauwaha moana. Ua hana ʻia kahi kaʻina hana like ma waena o ʻOkakopa-Dekemapa 2017, ma ke kūkulu ʻākau o nā hanana 2018 a ʻoi loa ma ka ʻāina ʻo Outer Rise. ʻO ke kaʻina 2017 e pili ana i luna o 350 M4+ hanana, me ʻehiku mau hanana M6+ (a me 1 M7+).
He ikaika loa ka ʻāina ʻo Loyalty Islands i ka seismically, a ʻo ka ʻāina i loko o 250 km o ke ōlaʻi ʻo Dekemaba 5, 2018 ua hoʻokipa ʻia he 24 mau olai M 7+ ʻē aʻe i ke kenekulia i hala. ʻO ka ʻōlaʻi nui loa he M 8.1 i ka mahina ʻo Kepakemapa 1920, aia ma kahi o 230 km i ke komohana ʻākau o kēia lā, aia ma ka hikina o ka ʻauwaha moana. ʻElima o kēia mau ʻōlaʻi M 7+ i hiki mai i ke komohana o ka auwaha moana, ʻo ia hoʻi he ōlaʻi M 7.7 i Mei 1995, 125 km i ka hikina hema, he olai M 7.1 i Ianuali 2004, 40 km i ka hikina hema, a me ka M7.0 i ʻōlelo ʻia ma luna. .2017 ōlaʻi i Nowemapa 70, 2004km i ke komohana ʻākau. ʻAʻole i ʻike ʻia kekahi o kēia mau mea i hana i kekahi pōʻino a i ʻole nā mea make. ʻO ka ʻōlaʻi ʻo Ianuali 7.1 M 270 kekahi ʻāpana o kahi kaʻina hana ma kahi o 2003 mau hanana, e hoʻomaka ana i ka mahina ʻo Dekemaba 7.3. ʻO ia kaʻina i loaʻa nā ōlaʻi interplate thrust faulting (ʻo ka hanana nui loa ma ke kaʻina he ōlaʻi M 27 thrust faulting ma Dekemaba 2003, 25. ) a me nā ōlaʻi hewa maʻamau i ke komohana o ka ʻauwaha moana. Ma waena o Dekemaba 2003, 3, a me Ianuali 2004, 12, 6 mau olai o M 2003+ i hiki mai. Ua pau ka hopena o ka 2004-2004 i ka hoʻomaka ʻana o Pepeluali o XNUMX.
He aha e lawe ʻia mai kēia ʻatikala:
- The December 5, 2018 earthquake is sixth M 6+ earthquake to occur in this region over the past three months, and is part of an active sequence of events that began on August 29th, 2018 with a M 7.
- 5 earthquake east of New Caledonia in the southwest Pacific Ocean occurred as the result of shallow normal faulting within the oceanic crust of the Australia plate, just west of the South New Hebrides Trench which marks the plate boundary between the Australia and Pacific plates in this region.
- At the South New Hebrides Trench, Australia lithosphere converges with and sinks beneath the Pacific plate, descending into the mantle and forming the New Hebrides/Vanuatu subduction zone, stretching from New Caledonia in the south to the Santa Cruz Islands in the north, a distance of about 1,600 km.
