Many experts such as Nick Begich, author of "Angels Don't Play This HAARP", suspect Extremely Low Frequencies (ELF) can induce an earthquake. The HAARP facility in Gakona, AK has gained notoriety as a possible offensive weapon. A Sea-Based X-Band Radar (SBX) system is getting attention as a seafaring platform that can transmit ELF. Jack Blood suspects SBX as the trigger in Japan quake in recent article at his Deadline Live website, "The broadcast was most likely being transmitted from a floating HAARP system like the floating Sea-Based X-Band Radar platform that can be moved anywhere in the Pacific or Atlantic ocean under the protection of a carrier strike group—like the USS Ronald Reagan." The USS Ronald Reagan was located in the Western Pacific at the time.
Blood supports his argument with frequency data from the HAARP Induction Magnetometer, "what you can also see is a constant ULF frequency of 2.5 Hz being recorded by the magnetometer. [technically, below 3Hz is Ultra Low Frequency (ULF)] The ULF 2.5 Hz frequency is evidence of an induced earthquake. The chart recorded this constant before, during and after the 9.0 magnitude earthquake struck." A 2.5 Hz frequency is viewed as a signature frequency for inducing an earthquake! Blood asks us to keep an open mind on the cause of Japan quake and that there is evidence to support an argument that it's more than just conspiracy theory!