Event Alarm Status
This page displays the status of automated event-detection alarms for Pre-eruption uplift and Co-eruption subsidence, using the realtime data (updated every 15 minutes) from the Bottom Pressure Recorders (NANO-BPRs) on the BOTPT instruments at Axial Seamount, part of the National Science Foundation's (NSF) Ocean Observatories Initiative (OOI) Regional Cabled Array (RCA), operated by the University of Washington. The dates/times in the plots below are in GMT (+8 hrs of local PST, or +7 hrs of PDT time on the US west coast).
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Alarm Status & Long-Term Rate Summary Table
The table below shows the current status of event-detection alarms and long-term single-station uplift rates, updated every 15 minutes. The alarms are for two possible events: (1) pre-eruption rapid uplift (rate of depth change > +10 cm/hr over the last 20 mintues), or (2) co-eruption rapid subsidence (rate of depth change < -10 cm/hr over the last 20 mintues). The table also includes the latest long-term uplift rates calculated from the previous 8- and 12-week time periods, updated daily.
Plot 1: Event alarm and long-term rate summary table, updated every 15 mintues.
Short-Term Rates
The plots below show the short-term rates of depth change that are used for the event-detection alarms in the table above. There is a pair of plots for each of the four BOTPT instruments, showing short-term rates from the last 7 days and over the entire record. The green dots are depth change in cm per 5 minute time intervals (used for a tsunami alarm). The red dots are depth change between an average computed from data 0-10 minutes ago compared to an average 10-20 minutes ago, in cm/hour (used for uplift & subsidence alarms).
BOTPT-A301-MJ03F - Central Caldera
Plot 2: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the last 3 days, used for event detection alarms.
Plot 3: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the entire record, used for event detection alarms.
BOTPT-A302-MJ03E - Eastern Caldera
Plot 4: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the last 3 days, used for event detection alarms.
Plot 5: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the entire record, used for event detection alarms.
BOTPT-A303-MJ03D - International District
Plot 6: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the last 3 days, used for event detection alarms.
Plot 7: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the entire record, used for event detection alarms.
BOTPT-A304-MJ03B - ASHES Vent Field (deployed mid-August 2017)
Plot 8: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the last 3 days, used for event detection alarms.
Plot 9: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the entire record, used for event detection alarms.
Short-Term Rates during the 24 April 2015 eruption
The plots below show the event alarm status and the short-term rate plots from 25 April 2015, the day after the 24 April eruption started. No plot is shown for the MJ03D - International District BOTPT instrument because it was off-line at the start of the eruption.
Alarm Status & Long-Term Rate Summary Table
Plot 10: Event alarm and long-term rate summary table, from 25 April 2015, the day after the 24 April eruption began.
BOTPT-A301-MJ03F - Central Caldera - 25 April 2015
Plot 11: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the 3 days before 25 April 2015, used for event detection alarms.
BOTPT-A302-MJ03E - Eastern Caldera - 25 April 2015
Plot 12: Plot of short-term rates of depth change from the last 5- and 10-20-minutes, over the 3 days before 25 April 2015, used for event detection alarms.