Upper-plate normal faults along forearcs often accumulate slip during > Mw 6 earthquakes. Such normal faults traverse the forearc of the Hellenic Subduction System (HSS) in Greece and are the focus of this study. Here, we use detailed field-mapping and analysis of high-resolution Digital Elevation Models (DEMs) to study 42 active normal faults on the islands of Kythira and Antikythira in the Aegean Sea. Onshore fault kinematic data are complemented by seabed bathymetry mapping of ten offshore faults that extend along the Kythira-Antikythira Strait (KAS). We find that normal faults in the KAS have lengths of ~1-58 km and scarps ranging in height from 1.5 m to 2.8 km, accommodating, during the Quaternary, trench-orthogonal (NE-SW) extension of ~2.46 ± 1.53 mm/a. Twenty-eight of these faults have ruptured since the Last Glacial Maximum, with their postglacial (16±2 ka) displacement rates (0.19-1.25 mm/a) exceeding their Quaternary (≤ 0.7-3 Ma) rates (0.03-0.37 mm/a) by more
Frontiers | Paleoseismological Findings at a New Trench Indicate the 1714 M8 1 Earthquake Ruptured the Main Frontal Thrust Over all the Bhutan Himalaya
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my expectation is ridge crest is having a difficult time tonight. it is a fore shock. after shock becomes bigger than the main shock. we change the name. everything before the 7.1 would be considered a fore shock to this. this is an earthquake sequence. it will be ongoing. it is cloerly a very energetic system. sequence. so there s no reason to think that we can t have more large earthquakes. the largest after shock on average to a 7.1 would be a magnitude 6. another 6.0 similar to yesterday would not be surprising to anybody. we don t have a lot more information. you can see on the map where the locations of the earthquake and after shock are, the blue are all earthquakes that happened before the 7.1.
there s been no loss of life or serious injury. it is dark there right now. hopefully by morning light the situation will remain the same. the lady you re watching on your screen right now her name is dr. lucy jones, a seismologist and she s giving us an update. listen. well, it was triggered by the 6.4, so this is an earthquake sequence. what s the chance they re independent, it s essentially zero. you were calculating before a guessing on the power of a 7.1 being larger than a 6.4. could you go over that again how much i didn t go and redo the calculations. did you? yeah, so let me do this quickly in my head. i think it s about a factor of 8 more powerful in terms of the amount of energy that is released during the earthquake. now it s being released over a