7.9 on Tuesday, at 3:17 am (GMT +9:30) – Banda Sea, Indonesia 7.2 on Saturday, at 7:48 pm (GMT -11) – 61 mi S of Sand Point, Aleutians East, Alaska, USA 7.1 on Tuesday, at 3:55 am (GMT +8) – Java Sea, 189 km N of Matalam, Lombok, West Nusa Tenggara, Indonesia 6.9 on Friday, at 9:09 pm (GMT +12) – South Pacific Ocean, New Zealand 6.3 | South China Sea, 136 km NE of Laoag, Province of Ilocos Norte, Philippines. 4.7 | Svalbard & Jan Mayen, 271 km E of Scoresby Sound, Østgrønland, Greenland - Strongest quake: Mag. We try to estimate recurrence periods according to the different magnitudes of the earthquakes, but then the behavior can be chaotic, with two strong earthquakes over a short period and then nothing for a very long time.See all quakes in the past 24 hours! A strong magnitude 6.3 earthquake hit South China Sea, Philippines, 13 hours ago. Unfortunately, we can't predict anything. Is it possible to predict this kind of event? The first tear can lead to the rupture of another fault through a cascade effect, which is why there is sometimes a risk of a stronger earthquake after the first one. Traditionally, we tend to say that aftershocks diminish in intensity.īut in Turkey, one earthquake triggered another. It was a "small" earthquake, but as it occurred at a depth of just one kilometer, it shook things up a lot.Įven if they are less strong, they can lead to the collapse of buildings already weakened by the earthquake. This is what happened in France in 2019 in the Teil region in the (southern) Ardeche region. The closer you get to the surface, the greater the effect of the rupture. Then there's the depth: at first it was estimated to be at around 25-30 kilometers, but it seems to be going back up, closer to 10 kilometers. Obviously, this shakes the region enormously. This corresponds roughly to an average displacement on the fault line of around one meter in a few seconds, over several kilometers. We're talking about 6.8 or 6.9, which is quite strong. We need to see what magnitude the earthquake will be. What explains the violence of the Morocco quake? But we are still dealing with plate boundaries. Here, we're seeing more of a convergence between Africa and Eurasia or Iberia, the Spanish part, and overlapping faults. There was a horizontal sliding of the (tectonic) plates. In Turkey, we had horizontal movement, because Turkey is shifting to the West, moving towards Greece. Was the Morocco quake similar to the one in Turkey in February? This type of earthquake is what leads to the rise of the High Atlas range. The epicentre of the recent quake is not in the most active area of Morocco. Looking further back in history, there were earthquakes in the 18th century, probably around magnitude 7 in the Fez region. The Agadir earthquake (magnitude 5.7 in 1960) destroyed the entire city and killed almost 15,000 people, and more recently there was the Al Hoecima earthquake (magnitude 6.4 in 2004), further out on the Mediterranean. Morocco is one of those countries where the question is not whether there will be earthquakes. Philippe Vernant-a specialist in active tectonics, particularly in Morocco, at the University of Montpellier-answered AFP's question's on the devastating quake.
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