Cite this Report According to a news report, a dating cafe hameln of earthquakes occurred beneath Tristan da Cunha during the nights of 28 and 29 July. After the swarm, there were a few individual earthquakes and then activity tapered off.
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Click on the index link or scroll down to read the reports. All times are local unless otherwise noted August BGVN Cite this Report Earthquake swarm on July followed by floating pumice [This event was originally assigned to Tristan da Cunha, but later work located the earthquake swarm on the SE submarine flank of Nightingale Island, about 40 km S. These are designed to record T phases and use say dating bp 30 short-period seismometers sampled at samples per second.
This is the first time that seismicity near this volcano has been instrumentally recorded. Figure 1.
Station locations courtesy of R. An intense swarm of seismic activity was recorded, and felt, on the night of July. The activity lasted approximately six hours and peaked around UTC on 29 July.
There were a number of large earthquakes in the swarm; the largest, at approximately UTC on 29 July, had a body-wave magnitude of 4.
The epicenter was in the vicinity of the island, but location uncertainties make it impossible to say whether the source was onshore or offshore. Seismic activity continued to be recorded, and occasionally felt, throughout Augustbut was declining slowly figure 2.
No long-period earthquakes or tremor signals were positively identified although, according to Stewart, the temporal pattern of the swarm appeared to be volcanic. A pseudo-RSAM plot of the data from one of the stations showed that the activity grew gradually to a peak over a period of two or three hours and that the larger events occurred after this peak.
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Figure 2. Hourly count of earthquakes at Tristan da Cunha from 27 July to 31 August Events were counted manually on constant gain plots. The counts of earthquakes during the initial swarm were more than per hour.
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Courtesy of R. Stewart described the earthquakes as follows.
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With only two stations, it is not possible to determine individual hypocentres with any confidence and the locations of the earthquakes can only be inferred from general observations made on the data. First-motion analysis of the P waves was made difficult because the arrivals were very small on the horizontal components.
However, it was possible to determine that the P wave was always arriving from the SE at both stations and that the angle of incidence of the arriving P wave was very steep, within 10 degrees of vertical.
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S-P say dating bp 30 were between 4 and 5 seconds at both stations, with H09N1 typically a fraction of a second longer than H09W1. Depending on the velocities assumed, these S-P times indicate that the earthquakes were between 20 and 30 km from the stations.
The simplest interpretation of both the above observations is that the earthquakes occurred at depth directly below the say dating bp 30. However, an offshore location to the SE cannot be ruled out.
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What is certain is that these events occurred close to the volcano. One newspaper account from the Tristan Times on 6 August described "angular and not round" rocks seen by fishermen floating "all around the Island.
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Figure 3. Photographs of pumice collected near Tristan da Cunha, August Courtesy of James Glass, Tristan Times. The Tristan Times also reported on 30 September that volcanologist Victoria Hards from the British Geological Survey BGS arrived on the island on 10 September to assess the potential threat of the recent seismic activity.
She reportedly determined that the July event was caused by rising magma 25 km SE of the island.
She also noted that there was no sign of activity at the eruption site, and no eruption was imminent so there was no threat to the settlement. The BGS planned to monitor the seismic data over the next four months to assess any longer-term implications.