Activity at the Soufrière Hills Volcano is low, although seismicity remains slightly elevated.
The seismic network recorded five VT earthquakes, ten hybrid events, eight long-period events and three rockfalls this week. As with previous weeks there is no clear pattern to the activity, although a number of these events occurred in short bursts.
Sulphur dioxide measurements on three days this week gave an average output of 436 tonnes per day, with a maximum of 543 and a minimum of 359. Unusual wind directions prevented measurements for the rest of the week.
Clear views of parts of the dome this week showed very little change, apart from some modification to the steep eastern face owing to formation of the pyroclastic flow on 29 August.
Pyroclastic flows can occur at any time without warning on any side of the volcano, including Gages from where they can travel rapidly into Plymouth. Tracks across the Belham valley are frequently destroyed or heavily modified by flash flooding or lahars, and caution should be exercised crossing the valley during and after rainfall.
The Hazard Level is 2. There is no access to Plymouth or Zone V. There is daytime access (8:00 am to 4:00 pm) to Zone C. Maritime zone W remains daytime transit only (boats may sail through the zone but must not stop).