An ultra-long-period seismograph galvanometer

Establishment of a Long-period Seismograph Network Utilizing Magnetic Tae Recording

Long period grating in multicore optical fiber: an ultra-sensitive vector bending sensor for low curvatures.

Long period grating was UV inscribed into a multicore fiber consisting of 120 single mode cores. The multicore fiber that hosts the grating was fusion spliced into a single mode fiber at both ends. The splice creates a taper transition between the two types of fiber that produces a nonadiabatic mode evolution; this results in the illumination of all the modes in the multicore fiber. The spectra...

Ultra-Short Period Double-Degenerate Binaries

We review the current observational status of the ROSAT sources RX J1914.4+2456 and RX J0806.3+1527, and the evidence that these are ultra-short period (< 10 min) binary systems. We argue that an Intermediate Polar interpretation can be ruled out, that they are indeed compact binaries with a degenerate secondary, and that the period seen in the X-ray and optical is the orbital period. A white d...

Observations of ultra-long period normal modes from the 2004 Sumatra-Andaman earthquake

The great December 2004 Sumatra-Andaman earthquake was the first "giant" or "extreme" (moment magnitude Mw ≥ 9) earthquake recorded by broadband digital seismometers whose data were rapidly available to investigators worldwide. As a result, analysis of the earth’s longest period normal modes became a primary tool for studying the earthquake, rather than an elegant afterthought. The mode data pr...

bservations of ultra - long period normal modes from the 2004 umatra – Andaman earthquake mile

The great December 2004 Sumatra–Andaman earthquake was the first “giant” or “extreme” (moment magnitude Mw ≥9) earthquake recorded by broadband digital seismometers whose data were rapidly available to investigators worldwide. As a result, analysis of the earth’s longest period normal modes became a primary tool for studying the earthquake, rather than an elegant afterthought. The mode data pro...