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Category Archives: tectonics
Friday(ish) Focal Mechanism: a kinky slab beneath Mexico
A quick look this week at the magnitude 6.5 earthquake that shook southern Mexico last Sunday. It caused a fair amount of shaking in Mexico City, and a few deaths, but apparently no major structural damage. The depth of the … Continue reading
Categories: earthquakes, focal mechanisms, tectonics
The Oklahoma Earthquakes
There was some slight seismic excitement over the weekend in central Oklahoma: a magnitude 4.7 earthquake shook things up early on Saturday morning, which turned out to be the prelude to magnitude 5.6 tremor late Saturday evening. The focal mechanisms … Continue reading
Categories: earthquakes, focal mechanisms, tectonics
M 7.2 earthquake near Van, eastern Turkey
Earlier this morning, a magnitude 7.2 earthquake hit near the city of Van on the eastern border of Turkey. The BBC reports that at least 45 people have died as buildings collapsed close to the rupture. The most well-known seismic … Continue reading
Categories: earthquakes, focal mechanisms, geohazards, tectonics
Does plate tectonics control magnetic reversals?
Possibly, but this paper will not convince you. Continue reading
Categories: Cenozoic, geophysics, Mesozoic, palaeomagic, tectonics
Proof of earthquake triggering in Christchurch? Not so fast…
When a magnitude 6.3 earthquake scored an almost direct hit on Christchurch in February, I discussed the possibility that rather than being a simple aftershock of the Darfield earthquake last September, it was an example of the earlier quake triggering … Continue reading
Categories: earthquakes, tectonics
Update: Christchurch aftershocks
As the aftershocks of the Darfield quake continue, where do the future seismic dangers lie? Continue reading
Categories: earthquakes, geohazards, tectonics
The far-travelled ground
Be honest: when Evelyn asked the geoblogosphere, ‘what’s your favourite geology word?’, you all knew which word I was going to pick, didn’t you? Allochthonous. Allochthonous, the word that no-one can spell. Allochthonous, the word no-one can pronounce, it seems, … Continue reading
Seismo-volcanism in Eritrea
The Great Rift Valley marks where East Africa is slowly attempting to break away from the rest of the African continent, at a rate of less than a centimetre a year. At the north-eastern end of the rift, where it … Continue reading
Categories: earthquakes, focal mechanisms, tectonics
More large aftershocks rattle Christchurch: will it ever end?
Analysis of the ongoing earthquake sequence. Continue reading
Categories: earthquakes, focal mechanisms, geohazards, tectonics
The many faces of earthquake triggering
Can large earthquakes beget more large earthquakes? It’s an easy question to ask, but much more difficult to answer. Depending on the distance from, and time since, the initial earthquake, the processes that may result in ‘seismic triggering’ are very … Continue reading
Categories: earthquakes, geohazards, tectonics
