Iwariri ilẹ 7.5 ti o lagbara waye ni alẹ Ọjọ Ọjọrú 185 km Guusu ti Awọn ere iṣootọ. ni 6.08 pm akoko agbegbe, Oṣu kejila 5.
Awọn alaṣẹ agbegbe ni Vanuatu ṣe ikilọ tsunami agbegbe kan, ṣugbọn ni ibamu si USGS ni Hawaii ko si ikilọ ti o wa ni aaye fun Pacific Ocean pẹlu Guam ati Hawaii.
Location:
- 168.2 km (104.3 mi) ESE ti Tadine, New Caledonia
- 254.4 km (157.7 mi) ESE ti W New Caledonia
- 298.9 km (185.3 mi) E ti Mont-Dore, New Caledonia
- 309.9 km (192.2 mi) E ti Dumba, New Caledonia
- 311.1 km (192.9 mi) E ti Noumea, New Caledonia
Oṣu Kejila 5, 2018, iwariri ilẹ M 7.5 ni ila-oorun ti New Caledonia ni iha iwọ-oorun guusu Iwọ-oorun Pacific waye bi abajade ti aiṣedede deede aijinlẹ laarin eeri okun ti awo Australia, ni iwọ-oorun iwọ-oorun ti South New Hebrides Trench eyiti o ṣe ami ala awo naa laarin Awọn awo Australia ati Pacific ni agbegbe yii. Awọn solusan siseto oju-ọrun tọka aṣiṣe ti o ṣẹlẹ lori ibajẹ fifọ niwọntunwọsi lilu boya si ariwa-oorun tabi si guusu ila oorun. Ni ipo ti iwariri-ilẹ yii, awo Australia gbe si ọna ila-oorun-ariwa-oorun pẹlu ọwọ si Pacific ni iwọn to sunmọ 78 mm / yr. Ni Trench South New Hebrides Trench, Australia lithosphere awọn apejọ pẹlu ati awọn rirọ labẹ awo Pacific, ti o sọkalẹ sinu aṣọ atẹgun ti o si ṣe agbekalẹ agbegbe subduction tuntun ti Hebrides / Vanuatu, ti o na lati New Caledonia ni guusu si Santa Cruz Islands ni ariwa, ọna jijin ti o to 1,600 km. Oṣu Kejila 5, 2018, iwariri-ilẹ waye nitosi isun omi yii, ati ni iha iwọ-oorun rẹ, ni agbegbe tectonic nigbakan ti a mọ ni “igbega ita” nibiti awo abẹle ti bẹrẹ ni fifin (fifa) ṣaaju ki o to rì sinu ẹwu na. Ipo, ijinle, ati ojutu ọna ẹrọ iṣojukọ ti iwariri-ilẹ yii ni gbogbo ibamu pẹlu iṣẹlẹ ti o waye bi abajade ti aiṣedede intraplate ni agbegbe igbega ita yii.
Lakoko ti a ṣe ipinnu ni igbagbogbo bi awọn aaye lori awọn maapu, awọn iwariri-ilẹ ti iwọn yii ni a ṣe apejuwe ni deede bi yiyọ lori agbegbe ẹbi nla kan. Awọn iṣẹlẹ aiṣedeede deede ti iwọn ti iwariri ilẹ ti Oṣù Kejìlá 5, 2018 jẹ deede nipa 75 × 30 km ni iwọn (ipari x iwọn).
Iwariri ti Oṣu Kejila 5, 2018 jẹ iwariri kẹfa M 6 + lati waye ni agbegbe yii ni oṣu mẹta to kọja, ati pe o jẹ apakan ti iṣiṣẹ ti nṣiṣe lọwọ ti awọn iṣẹlẹ ti o bẹrẹ ni Oṣu Kẹjọ Ọjọ 29th, 2018 pẹlu M 7.1 interplate tẹnumọ iwariri iwariri si ila-oorun ti Trench New Hebrides Trench ati nipa 70 km si ila-ofrun ti iwariri ilẹ Oṣù Kejìlá 5, 2018. Ni akoko yii, nipa awọn iwariri-ilẹ 140 M 4 + ti gba silẹ ni agbegbe yii nipasẹ USGS, pupọ fa awọn iwariri-ilẹ aiṣedede si ila-oorun ti aala awo. Iwariri ilẹ ti oni ṣaju nipasẹ awọn iṣẹju 4 nipasẹ iwaju M 6.8 kan, to fẹrẹ to kilomita 13 siwaju si iwọ-oorun ti yàrá okun. Ọna ti nṣiṣe lọwọ bakanna waye laarin Oṣu Kẹwa-Oṣu kejila ọdun 2017, ni iha ariwa ti awọn iṣẹlẹ 2018 ati pupọ julọ ni agbegbe Ikun Ode. Ọna 2017 kopa si oke ti awọn iṣẹlẹ 350 M4 +, pẹlu awọn iṣẹlẹ M6 + (ati 1 M7 +).
Ekun Awọn Igbẹkẹle Loyalty n ṣiṣẹ ni jigijigi pupọ, ati pe agbegbe laarin 250 km ti iwariri ilẹ Oṣù Kejìlá 5, 2018 ti gbalejo awọn iwariri-ilẹ M 24 + miiran 7 miiran ni ọdun ti o ti kọja. Eyi ti o tobi julọ jẹ iwariri ilẹ M 8.1 ni Oṣu Kẹsan ọdun 1920, eyiti o wa ni ibiti o to 230 km si iha ariwa iwọ-oorun ti iṣẹlẹ oni, ni ila-ofrùn ti yàrá nla. Marun ninu awọn iwariri-ilẹ M 7 + wọnyi ti ṣẹlẹ si iwọ-oorun ti kòtò omi-nla, pẹlu iwariri ilẹ M 7.7 kan ni Oṣu Karun ọjọ 1995, kilomita 125 si guusu ila-oorun, iwariri-ilẹ M 7.1 kan ni Oṣu Kini Oṣu Kini ọdun 2004, 40 km si guusu ila-oorun, ati M7.0 ti a ti sọ tẹlẹ. .2017 iwariri-ilẹ ni Oṣu kọkanla ọdun 70, 2004km si ariwa-oorun iwọ-oorun. Ko si ọkan ninu iwọnyi ti a mọ pe o ti fa ibajẹ tabi awọn apaniyan kankan. Iwariri ilẹ naa ni Oṣu Kini Oṣu Kini Ọdun 7.1 M 270 tun jẹ apakan ti ọkọọkan ti nṣiṣe lọwọ ti awọn iṣẹlẹ 2003, bẹrẹ ni Oṣu kejila ọdun 7.3. Ọkọọkan naa pẹlu awọn iwariri-ilẹ aiṣedede ti n tẹ aṣiṣe mejeeji pọ (iṣẹlẹ ti o tobi julọ ninu ọkọọkan naa jẹ iwariri iwariri ti M 27 ti n fa aṣiṣe ni Oṣu kejila ọjọ 2003, 25 ) ati awọn iwariri-ilẹ aiṣedede deede si iwọ-oorun ti kòtò omi okun. Laarin Oṣu Kejila 2003, 3, ati Oṣu Kini 2004, 12, awọn iwariri-ilẹ 6 ti M 2003+ ṣẹlẹ. Ọkọọkan 2004-2004 bajẹ ku ni ibẹrẹ-aarin Kínní ti ọdun XNUMX.
OHUN TO MU KURO NINU AKOKO YI:
- 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.
