Ukuzamazama komhlaba okumandla kwe-7.5 ePacific. Akukho sisongelo se-tsunami

Inyikima eyomeleleyo ye-7.5 yenzeke ngoLwesithathu ebusuku kwiikhilomitha ezili-185 emazantsi eLoyalty Islands. ngo-6.08 pm ixesha lasekhaya, nge-5 kaDisemba.

Abasemagunyeni basekhaya eVanuatu bakhuphe isilumkiso setsunami yasekhaya, kodwa ngokutsho kwe-USGS eHawaii akukho silumkiso sikhoyo kuLwandlekazi lwePasifiki kubandakanya iGuam neHawaii.

Indawo:

• I-168.2 km (104.3 mi) i-ESE yeTadine, iNew Caledonia
• I-254.4 km (157.7 mi) ESE ye-W New Caledonia
• I-298.9 km (185.3 mi) E yeMont-Dore, eNew Caledonia
• 309.9 km (192.2 mi) E of Dumba, New Caledonia
• I-311.1 km (192.9 mi) E yaseNoumea, eNew Caledonia

Inyikima kaDisemba 5, 2018, inyikima yeM 7.5 kwimpuma yeNew Caledonia kumzantsi ntshona woLwandlekazi lwePasifiki yenzeke ngenxa yempazamo eqhelekileyo phakathi kolwandle lwaseOstreliya, kwintshona nje yeNew Hebrides Trench ephawula umda wepleyiti phakathi kolwandle. Iipleyiti zaseOstreliya nePasifiki kulo mmandla. Izisombululo zendlela egxininisiweyo zibonisa ukuba kukho isiphene senzeke kumntla-ntshona okanye kumzantsi-mpuma. Kwindawo yale nyikima, ipleyiti yase-Australia ibheka ngasempuma-mpuma-mpuma ngokubhekiselele kwiPasifiki ngesantya esimalunga ne-78 mm/yr. KwiSouth New Hebrides Trench, iOstreliya lithosphere idibana kunye kwaye izike phantsi kwePasifiki ipleyiti, ihla iye kwingubo kwaye yenze ummandla weNew Hebrides / Vanuatu subduction zone, ukusuka eNew Caledonia emazantsi ukuya kwiziqithi zaseSanta Cruz emantla, umgama. malunga ne-1,600 km. NgoDisemba 5, i-2018, inyikima yenzeke kufuphi kakhulu nalo msele, kwaye nje ngasentshonalanga, kwingingqi ye-tectonic ngamanye amaxesha eyaziwa ngokuba "kukunyuka kwangaphandle" apho i-plate subducting iqala ukuguquguquka (ukwandisa) ngaphambi kokutshona kwi-mantle. Indawo, ubunzulu, kunye nesisombululo sendlela ekugxilwe kuyo kule nyikima zonke ziyahambelana nesehlo esenzekayo ngenxa yempazamo ye-intraplate kulo mmandla wonyuke wangaphandle.

Ngelixa ziqhele ukucwangciswa njengeengongoma ezikwiimephu, iinyikima zolu hlobo zichazwa ngokufanelekileyo njengokutyibilika kwindawo enkulu enempazamo. Iziganeko eziqhelekileyo eziphosakeleyo zobukhulu benyikima kaDisemba 5, i-2018 ngokuqhelekileyo malunga ne-75 × 30 km ngobukhulu (ubude x ububanzi).

Inyikima kaDisemba 5, i-2018 yinyikima yesithandathu ye-M 6+ eyenzeka kulo mmandla kwiinyanga ezintathu ezidlulileyo, kwaye iyinxalenye yolandelelwano olusebenzayo lweziganeko eziqale ngo-Agasti 29th, 2018 nge-M 7.1 interplate thrust inyikima empuma. yeSouth New Hebrides Trench kwaye malunga neekhilomitha ezingama-70 ukuya empuma yenyikima kaDisemba 5, 2018. Ngeli xesha, malunga ne-140 M 4+ iinyikima zirekhodwe kulo mmandla yi-USGS, eyona nto iqhubela phambili inyikima empuma kumda weplate. Inyikima yanamhlanje yandulelwa yimizuzu emi-4 yi-M 6.8 foreshock, malunga ne-13 km ukuya ngasentshona kumjelo wolwandle. Ukulandelelana okusebenzayo okufanayo kwenzeka phakathi kuka-Oktobha-Disemba 2017, ukuya ngasentla kweziganeko ze-2018 kwaye ubukhulu becala kwingingqi ye-Outer Rise. Ulandelelwano lwe-2017 lubandakanya iziganeko eziphezulu ze-350 M4 +, kubandakanywa iziganeko ezisixhenxe ze-M6 + (kunye ne-1 M7 +).

Ummandla weZiqithi zaseLoyalty usebenza kakhulu ngokuzamazama komhlaba, kwaye ummandla ongaphakathi kweekhilomitha ezingama-250 zenyikima kaDisemba 5, i-2018 iye yabamba ezinye iinyikima ze-24 M 7+ kwinkulungwane eyandulelayo. Elona nyikima inkulu yayili-M 8.1 ngoSeptemba 1920, eyayimalunga neekhilomitha ezingama-230 kumntla-ntshona wesiganeko sanamhlanje, kwimpuma nje yomsele wolwandle. Ezintlanu kwezi nyikima zeM 7+ zenzeke kwintshona yomjelo wolwandle, kuquka inyikima enguM 7.7 ngoMeyi 1995, i-125 yeekhilomitha ukuya kumzantsi-mpuma, inyikima enguM 7.1 ngoJanuwari 2004, iikhilomitha ezingama-40 ukuya kumzantsi-mpuma, kunye neM7.0 ekhankanywe ngasentla. .2017 inyikima ngoNovemba 70, 2004km ukuya kumntla-ntshona. Akukho nanye kwezi eyaziwayo njengebangele nawuphi na umonakalo okanye ukufa kwabantu. Inyikima kaJanuwari 7.1 M 270 yaba yinxalenye yolandelelwano lweziganeko ezimalunga nama-2003, ukususela ngoDisemba 7.3. Olo landelelwano lwaluquka zombini inyikima (esona siganeko sikhulu kolu landelelwano yayiyinyikima enguM 27 ngoDisemba 2003, 25) ) kunye neenyikima eziqhelekileyo eziye zenzeka kwintshona yomjelo wolwandle. Phakathi kukaDisemba 2003, 3, kunye noJanuwari 2004, 12, iinyikima ze-6 ze-M 2003+ zenzeka. Ulandelelwano luka-2004-2004 ekugqibeleni lwafa ekuqaleni kukaFebruwari ka-XNUMX.