Recording of deformation anomaly of a tsunamigenous earthquake using a laser strainmeter

Лазерно-Интерференционные Системы Исследования Цунамигенных Землетрясений

“…Наиболее перспективными для их регистрации и пеленгации являются лазерные деформографы горизонтального типа благодаря своим основным характеристикам: точности измерения микросмещений земной коры 0,1 нм, частотному диапазону от 0 (условно) до 1 000 Гц, динамический диапазон практически не ограничен при измерении естественных процессов инфразвукового диапазона. Регистрация деформационной аномалии лазерным деформографом [5], расположенным на м. Шульца, находящемся на значительном расстоянии от места генерации цунами, позволила сформулировать основы деформационного метода определения цунамигенности землетрясений [6].…”

“…The most promising for their registration and direction finding are horizontal laser strainmeters due to their main characteristics: the accuracy of measuring the microdisplacements of the Earth's crust is 0.1 nm, the frequency range is from 0 (conventionally) to 1000 Hz, the dynamic range is practically unlimited when measuring natural processes in the infrasonic range. Registration of the strain anomaly by a laser strainmeter [5] at Cape Schultz, located at a considerable distance from the place of tsunami generation, made it possible to formulate the foundations of the strain method for determining the tsunamigenicity of earthquakes [6].…”

Deformation Anomalies Accompanying Tsunami Origination

“…The deformation anomaly, described in [13] and to a greater extent corresponding to the concept of a "deformation jump", showed a small amplitude equal to about 60 µm and was recorded by a laser strainmeter at a distance of about 5600 km from its location of origin. It is clear that such deformation anomalies cannot be recorded by any broadband seismograph (velocimeter, accelerometer, etc.…”

“…For the first time period, a deformation anomaly was recorded during the registration of a tsunamigenic earthquake, the laser strainmeter of which showed the form of a deformation jump that occurred after the earthquake started [13]. Later, this result was generalized in [14] and the deformation methods used for determining the tsunamigenic nature of earthquakes were based on it.…”

<title>Laser-interference methods in hydroacoustic systems</title>

“…At use of the given methods in geophysics the newest measuring systems have been developed: laser strainmeters of various variants [1] and laser nanobarographs [2]. Their application has allowed to receive the new information on the nature of fluctuations and waves of geospheres of an infrasonic range [3][4][5]. Besides features of used laser-interference methods allow to expand a dynamic range of measured sizes considerably.…”