Category Archives: tectonics

Friday Focal Mechanisms: before and after the M8 Santa Cruz Islands quake

On Tuesday night American time (Wednesday lunchtime local time), a magnitude 8 earthquake occurred near the Santa Cruz Islands, a set of small islands east of the Solomon Islands. In this region, the Australian plate is subducting to the north-east … Continue reading

Categories: earthquakes, focal mechanisms, tectonics

Friday Focal Mechanism: the Himalayas’ long tectonic shadow

It wasn’t the biggest seismic event of the week, but this shallow (15 km depth) magnitude 6.0 that shook the remote southeast corner of Kazakstan on Monday still caught my attention. Located within the Tian Shan mountains, this earthquake is … Continue reading

Categories: earthquakes, focal mechanisms, tectonics

AGU Dispatches: Final Day and Final Thoughts

Unless you are presenting, the final day of a 5 day-conference can be a test of your intellectual fortitude: it can be tough to force your tired and stuffed-with-cool-new-science brain to take an interest in any more talks or posters. … Continue reading

Categories: academic life, conferences, earthquakes, geohazards, geology, geophysics, tectonics

AGU Dispatches: Superchrons and subduction

I started the day with my paleomagician’s hat on, sitting in on a session looking at the long term behaviour of the Earth’s dynamo. Changes in the strength and reversal frequency of the Earth’s magnetic field give a unique insight … Continue reading

Categories: conferences, palaeomagic, tectonics

Hotspot volcanism on Hawaii: textbook vs reality

Just like an iceberg, the parts of the Hawaiian Islands that you see above the ocean surface are dwarfed in volume by the stuff below the waves. For a start, any volcano that forms in the middle of the Pacific … Continue reading

Categories: geology, outcrops, photos, tectonics, volcanoes