Thanks for your comment. Although normally there are P waves (Push or Primary Waves) followed by S-waves (Shear or Secondary waves) This earthquake was recorded in the UK and therefore the s-waves were not recorded. This is because they cannot travel through the liquid outer core. The seismograph commentary refers to surface waves that were recorded some 90 minutes after the original p-waves arrived. These continued for some time after the quake, which shows how powerful it is!
It began with a P wave and the big jump is called the S wave. P wave is primary and the S wave is secondary.
seakay95 4 years ago
Hi,
Thanks for your comment. Although normally there are P waves (Push or Primary Waves) followed by S-waves (Shear or Secondary waves) This earthquake was recorded in the UK and therefore the s-waves were not recorded. This is because they cannot travel through the liquid outer core. The seismograph commentary refers to surface waves that were recorded some 90 minutes after the original p-waves arrived. These continued for some time after the quake, which shows how powerful it is!
jesharpe 4 years ago