Virtual Collaboration - Structure of the Earth by https://padlet.com/aaisha_baig/DCLVIrtualCollaborationStructureOfTheEarth Made with wonder en-us 2017-12-11 14:28:49 UTC 2024-07-11 16:04:23 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Rocket.png How to find distance of an earthquake's epicentre from a seismometer aaisha_baig https://padlet.com/aaisha_baig/DCLVIrtualCollaborationStructureOfTheEarth/wish/215034434 1) Measure the time between the arrivals of the first p-wave and first s-wave. In the seismogram below, this difference was 24 seconds.
2) Plot this time in the leftmost line of the diagram. This will also show the distance of the epicentre from the seismometer. The diagram below shows that the distance in this case was 215km.
3) Measure the amplitude of the strongest wave on the rightmost line. In the seismogram below, the strongest amplitude was 23 mm.
4) Draw a straight line between these 2 points on the graph. The magnitude of the earthquake is indicated by the part of the middle line your line intersects.

]]> 2017-12-11 14:47:05 UTC https://padlet.com/aaisha_baig/DCLVIrtualCollaborationStructureOfTheEarth/wish/215034434 We know how to find the distance of the epicentre, but how do we actually LOCATE where it is? aaisha_baig https://padlet.com/aaisha_baig/DCLVIrtualCollaborationStructureOfTheEarth/wish/215320177 To do this, we use a process called 'triangulation' where 3 seismometers with known radii detect p-waves and s-waves in order to find (at least) an approximate location of the epicentre.]]> 2017-12-12 09:07:29 UTC https://padlet.com/aaisha_baig/DCLVIrtualCollaborationStructureOfTheEarth/wish/215320177