Truro School Geology Department

Truro School Geology Department Truro School has one of the best Geology Departments in the country and a reputation that has been supported by numerous awards.

Responses to a M0.1 earthquake in Constantine, Cornwall on 2022-06-03 at 19:13:38 UTC recorded on the network in Cornwa...
07/06/2022

Responses to a M0.1 earthquake in Constantine, Cornwall on 2022-06-03 at 19:13:38 UTC recorded on the network in Cornwall. The Constantine raspberry shake seismometer is about 1 km from the epicenter. The earthquake was not picked up by the Truro School seismometer. See http://www.earthquakes.bgs.ac.uk/earthquakes/recent_events/20220603191301.html =summary for more information.

Here is a section from today's M3.8 earthquake in Shropshire, with data from Raspberry Shake seismometers across the cou...
30/05/2022

Here is a section from today's M3.8 earthquake in Shropshire, with data from Raspberry Shake seismometers across the country and as far as the Netherlands. RAD67, the seismometer labelled in red, is located in St Day.

Here is today's M3.8 earthquake from Wem in Shropshire at 2022-05-30 14:36:58UTC recorded across SW England and Brittany...
30/05/2022

Here is today's M3.8 earthquake from Wem in Shropshire at 2022-05-30 14:36:58UTC recorded across SW England and Brittany on the Raspberry Shake and BGS seismology networks. There is a page about the earthquake on the BGS web site here: https://earthquakes.bgs.ac.uk/earthquakes/recent_events/20220530143543.html =summary. You can see P-wave and S-wave arrivals, which get progressively later on seismometers further from the epicentre. The earthquake was also detected across the channel in Brittany.

Earthquake waves from a M7.3 earthquake 57 km ENE of Namie, Japan at 2022-03-16 14:36:33UTC at a depth of 63.07 km, reco...
16/03/2022

Earthquake waves from a M7.3 earthquake 57 km ENE of Namie, Japan at 2022-03-16 14:36:33UTC at a depth of 63.07 km, recorded on the Raspberry Shake seismometer network in SW England and Brittany, as well as the local British Geological Survey seismometers. The section shows the arrival of seismic waves across the world, recorded on the global Raspberry Shake network. The Truro School seismometer is in bold, with red writing. See: https://earthquake.usgs.gov/earthquakes/eventpage/us6000h519/executive.

There was a cluster of three earthquakes near Carnmenellis to the west of Stithians Lake on 2022-02-01, a ML0.4 at 12:55...
22/02/2022

There was a cluster of three earthquakes near Carnmenellis to the west of Stithians Lake on 2022-02-01, a ML0.4 at 12:55:43, a ML0.3 at 16:38:04 and a ML0.0 at 19:49:56 which were detected on the BGS seismometer at Carnmenellis and on the local Raspberry Shakes seismometers. You can see more details of the ML0.4 earthquake here: https://earthquakes.bgs.ac.uk/earthquakes/recent_events/20220201125534.html =summary which was 17km from Truro.

A section from a 166.92 km deep M7.3 earthquake 121 km NNE of Lospalos, Timor Leste at 2021-12-29 18:25:52UTC recorded o...
30/12/2021

A section from a 166.92 km deep M7.3 earthquake 121 km NNE of Lospalos, Timor Leste at 2021-12-29 18:25:52UTC recorded on Raspberry Shake seismometers across the globe, with ours highlighted in bold. You can find out more information here: https://earthquake.usgs.gov/earthquakes/eventpage/us7000g7lx/executive. The earthquake originates from a subduction zone, but it is especially interesting because we sit in the core shadow zone, so the responses we see in Cornwall have come via the inner core, similar evidence to that used by Inge Lehmann to discover the solid inner core in 1936. See: https://en.wikipedia.org/wiki/Inge_Lehmann. The second plot shows the location map for the epicentre and the pathway of waves reaching SW England and Brittany from Timor Leste via the inner core.

Here is today's M7.5 earthquake 42 km NNW of Barranca, Peru at 2021-11-28 10:52:13UTC as recorded in SW England and Brit...
28/11/2021

Here is today's M7.5 earthquake 42 km NNW of Barranca, Peru at 2021-11-28 10:52:13UTC as recorded in SW England and Brittany on the Raspberry Shake and BGS Seismology networks. You can see P, S and surface wave arrivals. The BGS devices at Carnmenellis, Hartland and Yadsbury are all broadband devices, so they have picked up the low frequency surface waves much more effectively than the Raspberry Shakes. See: https://earthquake.usgs.gov/earthquakes/eventpage/us7000fxq2/executive for more information.

Here is another earthquake from Vanuatu, this time, a 128km deep, M5.6 earthquake near Luganville, Vanuatu at 2021-11-20...
21/11/2021

Here is another earthquake from Vanuatu, this time, a 128km deep, M5.6 earthquake near Luganville, Vanuatu at 2021-11-20 10:57:54UTC recorded in SW England and Brittany on the raspberry shake and BGS seismology networks. At 144.84° from Truro School, the seismometers are near the caustic, which Jack mentioned in his talk. The caustic is an angle at which refraction by the Earth's core concentrates seismic wave energy, resulting in a high amplitude response on the seismometers. See the USGS web site for more information about the earthquake: https://earthquake.usgs.gov/earthquakes/eventpage/us7000fvq5/executive.

If you attended the Royal Geological Society of Cornwall talk yesterday, either in person or online, then thank you for ...
18/11/2021

If you attended the Royal Geological Society of Cornwall talk yesterday, either in person or online, then thank you for your support.

Today we have detected two earthquakes that illustrate Jack's talk very nicely, a 109.8 km deep, light M4.9 earthquake from 16,708 km away in Vanuatu at 2021-11-18 07:18:40 UTC. Deep earthquakes suffer less attenuation, so the waves from this light earthquake can be seen clearly on the opposite side of the Earth to Vanuatu in Cornwall.

We also detected a 34.9km deep, M6.2 earthquake from 194 km ESE of Kokopo, Papua New Guinea at 2021-11-18 14:08:05 UTC. This earthquake places us in the P-wave shadow zone, but we can see a response because the P-waves have arrived via the solid inner core. This was the type of evidence that Inge Lehmann used to discover the inner core in 1936. The plot also shows a lot of noise in each of the Truro schools, in what was the mid-afternoon.

For more information about the earthquakes we have detected in Truro, see http://www.carpebble.co.uk/.

Join the Royal Geological Society of Cornwall in the Heseltine Gallery Studio, at Truro School, or via Zoom, on Wednesda...
16/11/2021

Join the Royal Geological Society of Cornwall in the Heseltine Gallery Studio, at Truro School, or via Zoom, on Wednesday 17th November at 7pm, for a talk at 7:30pm, about earthquake monitoring in Truro, from Mark Vanstone, Director of Studies, and A Level Geology student Jack Phillips. The picture is seismoArt created from seismic waves detected from Alaska, in Truro. https://www.facebook.com/groups/cornwallgeology/permalink/1035158057280633/

Friday's M8.2 earthquake in Alaska was the biggest of the year so far. Thankfully this Great earthquake was in a relativ...
31/07/2021

Friday's M8.2 earthquake in Alaska was the biggest of the year so far. Thankfully this Great earthquake was in a relatively sparsely populated area, so there was little damage reported. A plot showing responses on Cornish seismometers is attached, but perhaps of more interest is the ability to browse data from our local seismometers from this and other earthquakes. Take a look at this plot: http://carpebble.co.uk/seismic/summary_pages/01023.html and interactive map: http://carpebble.co.uk/seismic/maps/stday-earthquakemap.php?lat=55.3248&lon=-157.8414&zoom=8, the popup labels on the map have blue hyperlinks, which lead to more traces from the Cornish seismometers. The size of the epicentre markers is proportional to the magnitude, the colour relates to the depth. There is a lot to look at on the map, especially when you zoom out.

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