The magnitude of the earthquake was originally recorded as 9.0 on the Richter scale, but has been upgraded to between 9.1 and 9.3. At this magnitude, it is the second largest earthquake ever recorded on a seismograph. This earthquake was also reported to be the longest duration of faulting ever observed, lasting between 500(8.3 minutes) and 600(10 minutes)seconds, and it was large enough that it caused the entire planet to vibrate as much as half an inch, or over a centimetre.[4] It also triggered earthquakes in other locations as far away as Alaska.[5]
A new island at Home Reef, Tonga
NASA's ozone monitoring instrument (OMI) onboard the Aura satellite detected SO2 emissions from the vicinity of Home Reef beginning on 8 August . . .. Emissions appear to have peaked sometime on 8-9 August, indicated by the large SO2 cloud detected east of Tonga on 9 August. The total SO2 mass detected by OMI on 9 August was ~25 kilotons. The emission episode was over by 15 August. HYSPLIT forward trajectories indicate that the SO2 released on 8 August may have reached altitudes of 5 km or more. To our knowledge this is the first example of satellite detection of emissions from a submarine volcano. (SI/uSGS GVP Listserv)
The asteroid's chance for hitting Earth on April 13, 2029 has now been categorized as a 4 on the Torino Scale. The level 4 rating — never before issued — is reserved for "events meriting concern" versus the vast majority of potentially threatening asteroids that merely merit "careful monitoring."
A new island at Home Reef, Tonga
NASA's ozone monitoring instrument (OMI) onboard the Aura satellite detected SO2 emissions from the vicinity of Home Reef beginning on 8 August . . .. Emissions appear to have peaked sometime on 8-9 August, indicated by the large SO2 cloud detected east of Tonga on 9 August. The total SO2 mass detected by OMI on 9 August was ~25 kilotons. The emission episode was over by 15 August. HYSPLIT forward trajectories indicate that the SO2 released on 8 August may have reached altitudes of 5 km or more. To our knowledge this is the first example of satellite detection of emissions from a submarine volcano. (SI/uSGS GVP Listserv)
The asteroid's chance for hitting Earth on April 13, 2029 has now been categorized as a 4 on the Torino Scale. The level 4 rating — never before issued — is reserved for "events meriting concern" versus the vast majority of potentially threatening asteroids that merely merit "careful monitoring."
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