mount cleveland alaska mount cleveland known nearly symmetrical western end islands mountains west alaska cleveland high active larger arc natives named island fire goddess believed inhabited volcano team visited island gave current president active cleveland erupted times years eruption produced arc known volcanic fatality recently mount cleveland erupted times twice volcano limits opportunities study relies heavily satellites monitoring volcano primarily hazardous aircraft flights north pacific approach vicinity volcano volcanic ash released damage sensitive electronic equipment sensors geological setting mount cleveland located western end long volcanic chain extending coast alaska containing volcanic arc occurs zone north american plate plate moves deeper earth increasing pressure results loss certain elements compounds low boiling points minerals compounds water addition mantle wedge formed plates melting point allow form melted material rises surface forms volcano case etymology native currently given island referring fire goddess thought reside volcano volcano reference constant activity shows likely highly active distant past oral tradition states time western eastern halves separate islands joining created volcanic activity islands mountains geographic group cleveland neighbors given islands russian 19th century current given expedition originally observed uss concord like islands group named prominent american politicians time cleveland having named president geography structure mount cleveland symmetrical islands mountains volcanic group like grew explosive built layer layer concave shape lies southeast northeast mount cleveland forms western half broad uneven bell shaped highest volcanic islands island completely nearest settlement eastward mount cleveland wide base roughly volume volcano slope increases markedly height lower flanks near summit like cleveland flanks especially rough covered multiple overlapping lava flows debris fans form apron mountain lava flows built debris flows result snow melt caused heat eruption flows generally short thin thick somewhat mount cleveland tallest mountain group rarely completely constant activity snowfall lack extant erosion shows likely volcano forming years known events occurred mount cleveland summit vent small volcanic lower flanks times cleveland summit lava dome volcano eastern half connected narrow consists low lying volcanic prominent peaks heavily eroded partly glaciers known volcanic complex features measure elevation sample recovered easternmost point island history mount cleveland generally nature characterized short explosive ash clouds accompanied flows lava flows ash steam emissions lava dome growth bombs hot springs reportedly found volcano 1800s persistent activity observed 1980s 1990s mount cleveland site persistent steam emissions thermal represent constant background activity summit lava dome formed continuous intrusion summit late nearly explosions demolished dome june small dome observed little known cleveland early history makes difficult area investigate names caused confusion events nearby today possible events confirmed listed possible observed history mount cleveland erupted confirmed eruption occurred volcano erupted possibly possibly possibly possibly notable eruption index eruption occurred june june lava flows extended kilometers summit ash high produced large reportedly ejected carried sea force eruption distinction confirmed direct volcanic fatality alaska small detachment stationed volcano time left post early eruption walk returned probably killed mudslides approximately boat sent search purchase witnessed end eruption island abandoned remainder war mount cleveland erupted recently possibly possibly volcano received focused attention recent times increased activity erupted times times twice significant eruption eruption produced high ash dispersed alaska unusual distance allowed detailed satellite observations surrounding region site hours represented satellite imagery areas snow eruption significantly disrupted air traffic area june pilot reported ash producing explosion continuing seismic activity volcano placed orange watch category following day continues cleveland watch persistent summit suspects dome growth minor ash producing explosions occurred june july august volcano began low level eruption ash observed feet volcano erupted times single explosion detected april total volcano erupted times years monitoring today monitors activity satellite imagery cloud cover volcano makes events difficult follow addition low resolution satellite imagery allows minor events impression satellite picture pass unnoticed seismic instruments mountain nearest observed pilots flying volcano field study conducted late automatic system based thermal implemented following events recent years effort expand volcanic coverage westward biggest threat posed eruption mount cleveland ash damage sensitive electronic equipment planes aircraft traveling arctic come vicinity way avoid damage flight delays arrival time adds extra fuel costs cleveland assessed survey volcano high aviation threat score real time ground based monitoring present time
Mount Cleveland (Alaska)