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Archives May 2006

Night of 30/31 May - It was apparently clear last night but the glow from the extruding lavadome was noticeably absent. A stacked image of all of the enhanced images from last night shows the crater clearly, but no glow.

Night of 29/30 May - The sky cleared not long before sunset and remained clear all night! The glow from the lavadome was visible and there was a rock-fall and associated outburst on the images at 23:05. The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 271 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 165 kB)

Night of 18/19 May - There were several bright outbursts last night and the glow from the ensuing rock-falls was visible for a time after sunset. There was a much larger outburst at 04:17 this morning - which corresponded with a larger tremor at approximately the same time (e.g. see YEL webicorder trace).
The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 270 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 202 kB)

Night of 17/18 May - The glow from the lavadome was visible from sunset until just after midnight, followed by a couple of small outbursts at 02:05 and 02:55 last night. Nothing as exciting as the event s from Saturday night - May 13/14). The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 308 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 204 kB)

Night of 16/17 May - The glow from the lavadome was visible from sunset until about 03:00 this morning. The moon also illuminated the crater during the early morning.
The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 347 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 229 kB)

Night of 15/16 May - There were several small outbursts of activity in the crater last night - but it was much quieter than recent days. The bright light passing over Mount St Helens in the animations below was the full moon! If you are interested in Saturday's large rock-fall and outbursts, images from the Sugar Bowl camera clearly show a sizeable chunk of the "fin" broke away on Saturday night. Also of interest, some of the webicorder traces recorded the strong M7.4 quake which occurred near the Kermadec Islands this morning (e.g. see WIFE).
The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 409 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 250 kB)

Night of 14/15 May - There were numerous small rock falls and associated outbursts on last night's images, with several larger and brighter events occurring at 22:43, 00:49, 03:39, 04:19. Although none of these was as large or spectacular as the event that happened on Saturday night (see below). The almost full moon also passes through the scene just after 00:30.
The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 430 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 238 kB)

Night of 13/14 May - There was an enormous outburst of activity at approximately 22:50 last night. It appears as if a large part of the new "fin" may have collapsed in a spectacular way. The event is clearly visible in the webicorder traces from last night (e.g. Yellow Rock MSH) The bright light that passes above the crater from left to right immediately after the event is the moon just out of the frame and is not related to any volcanic activity. I have also posted the image from the beginning of the event on Daz Dayz.
The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The speed is set to 1 fps (5 minutes per second) for the first animation and only a limited set of images is included. The next two animations show all the images from last night at a speed of 6 fps (equivalent of half an hour in real time per second).
Flash movie - slow version showing images of the glow  (speed 1 fps, size 253 kB)
Flash movie - showing images of the glow (faster 6fps version, size 464 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 409 kB)

Night of 12/13 May - The moon illuminated the mountain for most of the night and there was a brief outburst at 01:25 and a couple of other small outbursts during the night. The first animation below shows the full frame processed images of the mountain which have been enhanced to maximise the brightness of the glow and the second shows those images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing enhanced images of the glow   (size 620 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 261 kB)

Night of 10/11 May - There were several bright outbursts of activity last night at 22:57, 00:07 and 03:28. The first outburst at 22:57 appears to have occurred near the top of the new and growing "fin", whereas the other two brighter events appeared to arise lower down on the lavadome.
The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 342 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 209 kB)

Night of 09/10 May - The weather was clear last night and the moon illuminated the mountain. There was a bright outburst from the lavadome at 22:35 which corresponded with a larger tremor as seen on the YEL webicorder. The glow lasted for several hours before fading from view. The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second).
Flash movie - showing images of the glow   (size 297 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain - only the area around the crater is animated (size 192 kB)

Night of 4/5 May (revisited) - The folks over at the Volcanocam have pointed out that it is now possible to see the 100m high "fin" that is growing out of the lavadome on the Volcanocam images. So I have generated a new background image for the stacked sequences, and reprocessed the enhanced images from yesterday. It is quite clear that the rock-falls on Thursday night originated at at least two different locations, with one of the bright outbursts originating at the top of the 'fin'. The animation speed is slowed down to 3 fps (equivalent to 15 minutes of real time per second in the animation) and only the area around the crater is animated.
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain  (size 140 kB)

Night of 04/05 May - There was nothing much to see on last night's images until just after midnight, then the sky lit up with numerous outbursts which lasted until sunrise this morning. The largest and brightest event corresponded with a strong tremor at 02:02 [e.g. see YEL webicorder trace]. From reviewing the images it seems apparent that there was a major rock-fall from the lavadome. The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second) and only the images where the glow was visible are included - just two images!
Flash movie - showing images of the glow   (size 220 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain  (size 340 kB)

Night of 02/03 May - There was a brief outburst last night at 21:37 which only lasted for 10 minutes (two images from the Volcanocam). There was no other signs of the glow throughout the night. The first animation below shows the processed images at the approximate brightness as seen in the Volcanocam images and the second shows enhanced images superimposed over a daytime image of the crater for reference. The animation speed is set at 6 fps (equivalent of half an hour in real time per second) and only the images where the glow was visible are included - just two images!
Flash movie - showing images of the glow   (size 51 kB)
Flash movie - enhanced images of the glow, superimposed on a background image of the mountain  (size 60 kB)