Good morning from a UK with slightly less dull weather! I want to discuss two topics which are often confused & misunderstood, but first I wanted to clarify a few things from yesterday's threads #earthquake #Stress #faults 1/n Referring back to the block diagram for dip-slip faults from yesterday, @CriticalStress_ noted that the stress arrows at the top were wrong. All faults have a confining (inward) compressional stress, but stresses from other directions can be larger 2/n

https://twitter.com/GeoSciTweeps/status/1063436049131716608

Hello again! As promised earlier I will attempt to explain a more complicated topic to do with earthquakes. The topic: Focal Mechanisms!!

Here are three focal mechanisms for three different quakes in New Zealand over the past decade. But what do they mean? 1/n Earlier today I introduced the different types of faults - strike-slip, reverse, normal & oblique. Focal mechanisms - also known as beachball plots - graphically display the alignment (strike), inclination (dip) & type (slip/rake) of a fault in a quake 2/n

https://twitter.com/GeoSciTweeps/status/1063446435818061824

Good afternoon! Today I thought I would talk about some basic seismological terms. Many of these terms are freely used by seismologists or in the news, but most are poorly understood by the public - very little of this is taught in schools 1/n When people talk about an earthquake, they talk about a sudden movement of rock beneath the surface of the Earth. This movement can reach the surface, but starts beneath. It is always the result of an outside force, such as pressure from water in rock or two plates colliding 2/n

As a further introduction, I thought it might be helpful to have a thread including the primary sources of information for earthquakes around the world & nationally. This will hopefully be useful for those interested in looking up about quakes in the future 1/n

https://twitter.com/GeoSciTweeps/status/1063060382443552771

The most often used source for earthquake information is USGS (@USGSted). They locate quakes all over the world, with a more detailed catalogue provided for the US & their associated territories (primarily Puerto Rico). Their website is here: earthquake.usgs.gov/earthquakes/ma… 2/n

Hi everybody, I am Jamie & I am a graduate in Geology from the UK. Over the next week I want to discuss and share stuff to do with earthquakes across the world. Before I start tweeting on any topics though I thought I spent a few tweets introducing myself 1/n First of all, my personal Twitter account is over at @UKEQ_Bulletin - a lot of information on what I have been doing over the past four years can be found there. I intend this short introduction to summarise that information & also expand on my own story 2/n

I got a request recently to give a Geologist's 'Field Trip Guide to Iceland'. Fortunately for you, I just finished putting one together... so let's chat geo-travel! A good trip to Iceland requires your own car and at least ten days to see everything. This guide is for a non-4WD, so I won't be sending you off into the highlands. If you do have highlands questions, feel free to DM.

How did this cliff form?
Thread- Evolution of western ghat escarpment and coastal plain This is the famous Konkan kada (cliff) N of Pune. A line of cliffs extends for several hundred km from S. Gujarat, Maharastra to N. Karnatak