1. A lava flow reaches the Pacific ocean at Hawaii Volcanoes National Park.
2. An aerial eruption of Puu O'o Cinder Cone, Hawaii Volcanoes National Park, Hawaii Island.
3. Horseback riders Waimea/Kamuela Countryside, Hawaii Island.
4. Late afternoon sun highlights the deep green of a Waimea/Kamuela hillside on the Big Island of Hawaii.
5. The Historic White House of Waimea/Kamuela.
9. Photo de Mauro Ficarelli (Quito, Ecuador)
10. Le Guagua Pichincha vu de la vallée de Quito - The Guagua Pichincha volcano viewed from the Quito valley
11. View into the summit crater (caldera) in fumarolic stage
12. Gloval view inside the summit crater : fumarollic activity on the main lava dome - On the right, an explosion crater
13. For photos : courtesy of Smithsonian Institution (Volcanic Alert Program)
14. Tentative de modélisation du panache éruptif (à partir des éléments fournis par les photos prises d'avion) 0064-0068: L'île de la Réunion
66. LIPARI (Italie)
69. NISYROS (Grèce)
70. Santorin et le mythe de l'Atlantide (Grèce)
76. STROMBOLI (Italie)
86. Le Vésuve : un volcan actif
91. VULCANO (Italie)
97. L'Islande une portion émergée de la dorsale médio-atlantique
102. Bardarbunga (Islande)
103. Le Grimsvötn (Islande)
104. Krafla (Islande)
105. La chaîne des Puys (France)
112. Synthèse sur le massif volcanique du Mont-Dore (France)
116. La prévision des éruptions volcaniques
122. Agua de Pau (Açores, île de São Miguel)
124. Sete Cidades (Açores, île de São Miguel)
126. Teide (île de Tenerife, Canaries, Espagne)
127. Cotopaxi (Equateur)
128. Le Guagua Pichincha (Equateur)
132. Le Misti (Pérou)
134. Le Paricutin
137. Le Popocatepetl (Mexique)
138. QUILOTOA (Equateur)
139. Ubinas (Pérou)
141. Le Villarrica (Chili)
142. Mont Adams (États-Unis)
143. Le Mont Garibaldi (Canada)
146. Mont Saint Helen's (États-Unis)
151. The massive size of the 230 square mile blast zone as seen from space is revealed in this 1980 false color composite image from the Landsat MSS satellite.
[Landsat, MSS Composite, 1980]
152. Massive chunks of the volcano, called hummocks, were transported down valley in the largest landslide in recorded history. Hummocks are the small, steep hills that can be seen in front of Spirit Lake. The debris avalanche deposit filled the valley, creating a natural dam that held back the lake waters until an outlet tunnel was completed in 1985.
[P. Frenzen, USDA Forest Service, 1991]
153. A band of standing dead trees marked the outer boundary of the 1980 blast zone. The singed needles bear testimony to the 660 deg F (350 deg C) temperature of the blast.
[Peter Frenzen, 1980]
154. Post-eruption view of a blast-sheltered, north facing ridge that was snow covered and facing away from the blast at the time of the eruption (blast was moving from right to left). Note the standing dead trees that are snapped off at the point where they were taller than the ridge. Trees that survived the eruption under snow can also be seen on the sheltered side of the ridge.
[P. Frenzen, USDA Forest Service, 1985]
155. Following the eruption blast zone streams like Clearwater Creek nine miles northeast of the volcano were filled with ash and logs.
[J. Franklin, USDA Forest Service, 1980
156. Following the eruption Ryan Lake, 12 miles north of the volcano, was filled with organic material ranging in size from large logs to dissolved organics. As fall rains washed in nutrients from the blast-shattered forest Ryan Lake was transformed into an organic rich stew teeming with microbial activity.
[S. Greene, USDA Forest Service, 1980]
157. Mudflows scoured and buried more than 100 miles (160 km) of river channel on the west and southeast sides of the volcano. The maximum height of the flow is evidenced by mud marks on trees 26 feet (8 m) above the Muddy River. Note the two people and helicopter as an indication of scale. [J. Franklin, USDA Forest Service, 1980]
158. Le Cantal
159. Cantal (France)
160. Paricutin(Mexique)
161. Popocateptl (Mexique)
162. Quilotoa (Equateur)
163. Ubinas (Pérou)
164. Villarica (Chili)
165. Mont Adams (USA)
166. Mont Garibaldi (Canada)
167. Mont Rainier (USA)
168. Erta Alé (Ethiopie)
169. Mont Cameroun (Cameroun)
170. Ol Doinyo Lengaï (Tanzanie)
171. Kilimandjaro (Tanzanie)
172. Kilauea (Hawaii)
173. Mauna Loa (Hawaii)
174. Ruapehu (Nouvelle Zélande
175. White Island (Nouvelle Zélande)
176. Rabaul Caldeira (Nouvelle-Bretagne)
177· Asie
178. Ararat (Turquie)
179. Asama-Yama (Japon)
180. Fuji-Yama (Japon)
181. Kawah Ijen (Indonésie)
182. Kelut (Indonésie)
183. Krakatau (Indonésie)
184. Okmok (Aléoutiennes)
185. Pinatubo (Philippines)
186. Tambora (Indonésie)
187. Antarctique
188. Erebus
189. Europe
190. Etna (Italie)
191. Lipari (Italie)
192. Nisyros (Grèce)
193. Santorin (Grèce)
194. Vésuve (Italie)
195. Vulcano (Italie)
196. Le Bardarbunga
197. Le Grimsvötn
198. Le Krafla
199. Le Laki ou Lakagigar
200. FRANCE (les volcans d'Auvergne) :
201. Le Mont-Dore
202. Le Cézallier
203. L'Ardèche(voir le site "Pays des jeunes volcans d'Ardèche", réalisation"de plein Vent")
204. Piton de la Fournaise (île de la Réunion)
205. Atlantique
206. Agua de Pau (Acores, Portugal)
207. Sete Cidades (Açores, Portugal)
208. Teide (Canaries, Espagne)
209. Amérique du Sud
210. Cotopaxi (Equateur)
211. Guagua Pichincha (Equateur)
213. Paricutin(Mexique)
214. Popocateptl (Mexique)
215. Quilotoa (Equateur)
216. Ubinas (Pérou)
217. Villarica (Chili)
218. Amérique du Nord
219. Mont Adams (USA)
220. Mont Garibaldi (Canada)
221. Afrique
222. Erta Alé (Ethiopie)
223. Mont Cameroun (Cameroun)
224. Ol Doinyo Lengaï (Tanzanie)
225. Kilimandjaro (Tanzanie)
226. Ruapehu (Nouvelle Zélande
227. White Island (Nouvelle Zélande)
228. Rabaul Caldeira (Nouvelle-Bretagne)
229. Asie
230. Ararat (Turquie)
231. Asama-Yama (Japon)
232. Fuji-Yama (Japon)
233. Kawah Ijen (Indonésie)
234. Kelut (Indonésie)
235. Krakatau (Indonésie)
236. Okmok (Aléoutiennes)
237. Pinatubo (Philippines)
238. Tambora (Indonésie)
239. Antarctique
240. Erebus
271. L'éruption du 8 mai 1902
272. Cantal (France)
300. Les facettes de l'Etna
360.

1. Mount St. Helens National Volcanic Monument Photo Library - Before & After the Eruption Mount

2. Before & After the Eruption

3. Before the 1980 eruption the Spirit Lake basin was cloaked in old-growth forest. The signboard marks a vegetation plot, one of only a few places where the Forest Service had recorded the composition of pre-eruption vegetation at an individual species level.
4. All traces of the pre-eruption forest were erased by the fiery pyroclastic flows (1300 deg F, 700 deg C) that flowed from the crater that same afternoon. The signboard marks same the same location as pre-eruption photo.
5. Before the eruption the ridges north of the volcano were shrouded in old-growth Pacific silver fir and mountain hemlock forests. The forest in this photo is growing on the site of the now popular Windy Ridge viewpoint, four miles (6 km) northeast of the volcano. The signboard marks a vegetation plot, one of only a few places where the composition of pre-eruption vegetation was recorded at an individual species level.
6. A repeat photo of the same location shows the scouring effects of the 300 mph, stone-filled blast that not only toppled the trees but also ripped them from the ground (blast direction is from left to right). The blast stripped the branches from the trees and deposited a jumbled pile of logs on the far side of the ridge.
7. Prior to the eruption mountain ridges northeast of the volcano supported old-growth Pacific silver fir and mountain hemlock forests. The person is standing at the center of a vegetation plot, one of only a few places where the composition of pre-eruption vegetation had been recorded at an individual species level.
8. A repeat photo of the same point, taken after the eruption, shows the effects of a blanket of volcanic ash that fell from a volcanic ash plume that drifted to the northeast on the prevailing winds. This is an area located downwind of the volcano and outside of the blast zone.
9. Pre-eruption view from the former summit of Mount St. Helens looking north with Spirit Lake and Mount Rainier in the background. Note the dark green color of the old-growth forests that occupied the valley to the north of the volcano and the ridges surrounding Spirit Lake.
10. The same view after the eruption shows the extensive removal of forest vegetation north of the volcano. The missing trees were buried by the massive landslide (debris avalanche) or ripped from the ground and/or toppled by the lateral blast.
11. Prior to the eruption high mountain lakes like Obscurity Lake, 10 miles north of Mount St. Helens, were characteristically clear due to extremely low levels of dissolved nutrients.
12. The same view after the eruption shows the extent of eruption damage to the forest surrounding Obscurity Lake. Note the large quantity of volcanic ash that was eroded from adjacent hillsides and deposited on large deltas at the mouth of inlet streams.
13. A pre-eruption view of Mount St. Helens from Spirit Lake shows the smooth, conical slopes of a very young, and potentially explosive volcano.
14. The same view shows the profound change in the volcano and Spirit Lake. The formerly clear mountain lake had been completely displaced by the massive landslide and choked with ash and organic debris.