Yanayin Samoa

Tsibirin Samoan jerin tsibiran tsibirai 16 ne da kuma tudun ruwa masu yawa da ke da fadin murabba'in kilomita 3,123 (1,206 sq mi) a tsakiyar Kudancin Pacific, kudu da equator, kusan rabin tsakanin Hawaii da New Zealand, wanda ya zama wani yanki na Polynesia da kuma babban yankin Oceania.  Tsibirin su ne Savaiʻi, Upolu, Tutuila, ’Uvea, Ta`ū, Ofu, Olosega, Apolima, Manono, Nu`utele, Niulakita, Nu`ulua, Namua, Fanuatapu, Rose Atoll, Nu'ulopa, da kuma Vailulu`u, Pasco banks, da Alexa Bank.     .

 Tectonics 
Tsibirin Samoan yana da siffofi da yawa waɗanda suka dace da samfurin hotspot mai sarrafawa, gami da dutsen mai fashewa na Vailulu'u wanda ke aiki a halin yanzu wanda ke ɗaure iyakar gabas. Koyaya, kusanci da sarkar zuwa ƙarshen arewacin rami na Tonga, da kuma kasancewar ƙananan dutsen wuta a kan abin da ya kamata ya zama mafi tsufa (~ 5 my) tsibirin yammacin Savai'i ya haifar da gardama game da samfurin fuka-fuki / hotspot mai sauƙi. Wataƙila tsibirin Samoan ya samo asali ne daga Pacific Tectonic Plate da ke tafiya a kan wani wuri mai zafi. Hanyar hotspot ta Samoa a wani bangare ya dace da babban rukuni na tsibirai da tsaunuka masu tsawo   , waɗanda mai yiwuwa an kafa su ne ta wannan hotspot, amma kuma sun haɗu da tsofaffin tsaunuka tare da babbar hanyar hotspot da Macdonald, Rurutu, da Rarotonga suka bari kuma suna da manyan wuraren fashewar dutsen wuta, mai yiwuwa saboda abubuwan da suka haifar da subduction na Pacific Plate a kusa da Tonga 

Vailulu'u dutse ne mai aman wuta da aka gano a shekarar 1975. Yana tasowa daga benen teku zuwa zurfin 593 m (1,946 ft) kuma yana tsakanin tsibiran Ta'u da Rose a ƙarshen ƙarshen sarkar hotspot na Samoa.  Ana ɗaukar dutsen basaltic don yin alama a halin yanzu na wurin da ake samu na Samoa.  Taron na Vailulu'u ya ƙunshi tsayin mita 2,000 (6,600 ft), faɗinsa, 400 m (1,300 ft) zurfin caldera mai siffar kwali.  Manyan yankuna guda biyu sun bazu gabas da yamma daga babban taron, daidai da yanayin yanayin Samoan.  Takaddama ta uku da ba ta yi fice ba ta kai kudu maso gabashin taronHart, S.R.; Coetzee, M; Workman, R; Blusztajn, Jerzy (2004). "Genesis of the Western Samoa seamount province: Age, geochemical fingerprint and tectonics". Earth and Planetary Science Letters. p. 38.

Rose Atoll da Malulu seamount suna iya zama ragowar inda hanyar ko dai Macdonald ko Rarotonga hotspots ta haye hanyar Samoa hotspot. Wasu tsaunuka a yammacin Samoa ("Samoan Seamounts" ), waɗanda aka sanya su tare da Tuvalu tsakanin shekaru miliyan 63 da 42 da suka gabata suna iya zama ragowar hotspot na Rurutu.  Wadannan kuma an san su da "interloper seamounts".  Sauran tsaunuka da ba a san su ba a Samoa an haɗa su da hotspot na Rurutu bisa ga shaidar geochemical.

 Tsibirin tsibirin Samoa 
TsibirinYankinYankin bakin tekuYawan jama'aBabban MahimmanciRushewar Dutsen na ƘarsheƘasar / YankinSavai'i1,69419543,1421,8581911 AZ Upolu1,125197143,4181,113Ba a sani ba Tutuila142.313555,876653440 AZ "Uvea"96438,333131Ba a sani ba Taʻū47.0232790931Ba a sani ba Ofu7.21511.471764911866 AZ Olosega5.16313.381726291866 AZ Apolima4.14.1975165Ba a sani ba Manono37.588937Ba a sani ba Nu'ute1.155.040180Ba a sani ba Niulakita0.42.2344.6CretaceousNu'ulua0.232.78096Ba a sani ba Namua0.182.08091Ba a sani ba Fanuatapu0.061.81031Ba a sani ba Rose Atoll0.050.7503.510,000 ya riga ya Nu'ulopa0.010.45037Ba a sani ba Jimillar3,126654252,905

 Yanayi 
Saboda matsayinsa a Kudancin Tekun Pasifik, tsibirin Samoan yana yawan fuskantar guguwar yanayi tsakanin Nuwamba da Afrilu.  Samoa tana da yanayin gandun daji mai zafi na iska (Köppen Af), tare da matsakaicin zafin shekara na 26.5 °C (79.7 °F).  Lokacin mafi sanyi yana faruwa daga Nuwamba zuwa Afrilu, kodayake ruwan sama mai ƙarfi yana iya faɗi a kowane wata.    
Yankin tsibirai masu girma sun ƙunshi ƙananan filayen bakin teku tare da dutsen wuta, dutse, tsaunuka masu tsawo a ciki. Abubuwan da ke cikin halitta sun haɗa da gandun daji, kifi, da wutar lantarki. Ƙananan tsibirai sune ragowar zoben tuff na dutsen wuta, wasu kawai murjani ne a saman murfin murjani na dutsen mai fitattun wuta.

Rose Atoll ita ce mafi gabashin tsibirin kuma mafi kudancin Amurka. Samoa ta Amurka ita ce gida ga National Park of American Samoa .

Duwatsu mafi girma sune: Mt Silisili (Savai'i) a   , Dutsen Fito (Upolu) a   , Dutsen Lata (Taʻū),   ; Matafao Peak (Tutuila) a   , Piumafua (Olosega) a   , da Tumutumu (Ofu) a   . Dutsen Pioa (Tutuila), wanda ake kira Rainmaker, yana da   . Sunia, Fofo I.F. (2009). A History of American Samoa. Amerika Samoa Humanities Council. Page 355. . : 3 Samoa ta Amurka ita ce kuma gida ga wasu tsaunuka mafi girma a duniya a   . Harris, Ann G. and Esther Tuttle (2004). Geology of National Parks. Kendall Hunt. p. 603. .