The observed anomalous tilt time development of static horizontal pendulum and anomalous time development of variations (noise) before earthquakes could be the basis for possible prediction of earthquakes. This case study showed the behaviour of rock mass before main earthquakes worldwide in the years 2007–2009 (Peru 15.8.07 (M=8), Indonesia 12.9.07 (M=8.5+7.9), Chile 14.11.07 (M=7.7), Fiji 9.12.07 (M=7.8), Andreanoff island 19.12.07 (M=7.2), Sichuan 12.5.08 (M=7.9), Kuril islands 24.11.08 (M=7.3), Indonesia 3.1.09 (M=7.6), Tonga 19.3.09 (M=7.6), N. Zeland 15.7.09 (M=7.8), Andaman island 10.8.09 (M=7.5), Samoa 29.9.09 (M=8.1)). It was shown that the anomalous tilt or variations of the pendulum movement started in many cases a few days up to weeks before the mainshock. The most of the biggest earthquakes were predictable and one of them (Kurile Islands 24.11.2008) was predicted 29 days before as a test of a validity of this prediction method. The paper will describe anomalous high stress time intervals, the anomalous effects observed before the biggest earthquakes and discussion of reliability of earthquake prediction.
The observed anomalous tilt time development of static horizontal pendulum and anomalous time development of variations (noise) before earthquakes could be the basis for possible prediction of earthquakes. It was shown that the anomalous tilt or variations of the pendulum movement started in many cases a few days up to weeks before the mainshock. The paper will describe anomalous high stress time intervals, the anomalous effects observed before the biggest earthquakes and discussion of reliability of earthquake prediction. For each of them, we have tried to find out whether or not the earthquakes were predictable using the devices available to us, the static vertical pendulums in particular. 2007). The main stage of the event started after the medium earthquake in Tai-wan (M=6.2) on 06/09/2007 when the pendulum noise doubled in both directions.
