Scientists detect month-long shaking on seafloor that could foreshadow mega quake similar to 3/11
Kyodo News, May 12, 2015 (emphasis added): A magnitude 6.8 earthquake rocked a wide area of Japan centering on the northeast early Wednesday [and] observed in areas ranging from Hokkaido in the north to Gifu Prefecture in central Japan.
UPI, May 12, 2015: According to NHK [it’s] the strongest earthquake to hit Japan since 2011.
NBC News, May 13, 2015: “We consider this morning’s earthquake to be an aftershock” [of the 3/11 quake] said Yohei Hasegawa, an official at the Japanese meteorological agency. The temblor, which struck just after 6 a.m. local time, was sparked by the Pacific tectonic plate “subducting,” or moving under, the main land plate, he added. Hasegawa warned that more tremors may be on the way. “It’s not just limited to this area alone.”
Japan Times, May 13, 2015: Moderate tremors were also felt in Tokyo… [Hasegawa] warned that another strong tremor could strike within a week, adding “if it happens (beneath) the sea, it could trigger a tsunami.”… a 78-year-old woman [said] “It reminded me of the disaster”… Kayoko Tamura [said] “It was the first time I felt such a strong earthquake here.”
NHK transcript, May 12, 2015: Officials… say it was the first strong earthquake to hit the region since July 2011 [and] aftershocks of a similar scale might come in the next week. >> Watch the broadcast here
CBS San Francisco, May 12, 2015 at 2:42pm: Earlier this week, scientists said they’ve recorded low frequency shaking on the ocean floor that may have been foreshadowing a larger earthquake similar to what was released during the 2011 earthquake.
CBS San Francisco, May 12, 2015 at 12:42pm: Mega Quake Warning In Rumblings Off Japan’s Coast Alarms Scientists… [A] team of researchers says a similar pattern is emerging in a subduction zone where two tectonic plates are engaged… “Monitoring of offshore seismicity off southern Kyushu, Japan, recorded a complete episode of low-frequency tremor, lasting for 1 month”… These quakes moved in waves along the tectonic ridge and stopped abruptly… potentially increasing stress that could be released in a “mega thrust” earthquake.