An earthquake alarm device, including an alarm lamp and a base. Inside the alarm lamp, there is a power supply module and an earth magnetic field detection module. The earth magnetic field detection module emits a sound and light early warning signal when identifying any earth field abnormality. The vibration sensing module I senses slight vibration and emits a sensing signal I. The vibration sensing module II senses strong vibration and emits a sensing signal II. The control chip i emits sound and light alarm signals after receiving the sensing signal II or the sensing signal I and sound and light early warning signal at the same time. The alarm lamp gives a light alarm after receiving a sound and light early warning signal. The lighting module receives sound and light early warning signals or sound and light alarm signals and provides lighting.

A system (100) for monitoring a subterranean structure comprises an array (10) with n acoustic sensors capable of detecting P-waves and/or S-waves from the subterranean structure and a central controller (120) for receiving a signal (X) from the sensors. The system further comprises a lookup table (20) comprising a pre-computed travel time curve (24) expressed as relative arrival times of a signal from a location (L.sub.m) to each of the sensors (1-n); a comparison unit for comparing the received signal (X) with the pre-computed travel time curve (24), and means for raising an alarm if the received signal (X) matches the precomputed travel time curve (24). Preferably, the alarm is raised if a computed semblance value (26, 27) exceeds a predefined threshold. The system may monitor several locations (L.sub.m) in parallel using a fraction of the computer resources and time required by prior art techniques.

The current invention enables a structure to remain virtually motionless while the ground underneath it is undergoing significant oscillatory accelerations, such as would occur during a tectonic event. This is achieved by using the Meissner effect to maintain controlled elevation of the structure above the ground, allowing the ground to oscillate underneath the structure. The structure is able to move virtually without friction along an array of symmetric and parallel magnetic fields, which are kept parallel to the axis of ground oscillation typically via input from accelerometers in the surrounding oscillating ground. Simple buffering mechanisms keep the elevated structure from moving beyond the lateral range of the parallel magnetic fields, and facilitate the structure's return to its rest position. In this manner, structural damage from high energy large amplitude earthquakes can be virtually eliminated. This system and method can be extended to any object in a vibrational environment.

A building safety verification system and a building safety verification method for estimating a degree of damage of a building after an earthquake occurs are provided. The building safety verification system includes: an inter-story displacement measurement unit which obtains, from measurement data of acceleration sensors which measure accelerations of a plurality of stories in a building, an inter-story displacement of each of the stories; a natural period measurement unit which obtains a natural period of microtremor of the building from measurement data of a micro vibration sensor which measures micro vibration of a highest story of the building or a story near the highest story; and a building safety evaluation unit which evaluates soundness of the building from the inter-story displacement obtained by the inter-story displacement measurement unit and the natural period obtained by the natural period measurement unit.

A method of determining a peak ground acceleration includes providing a DFOS instrument connected to at least one optical fiber and recording DFOS data with the DFOS instrument. The DFOS data includes strain data along the at least one optical fiber. The method also includes converting the strain data into complex Fourier coefficients, scaling the complex Fourier coefficients, applying an inverse transform to the scaled Fourier coefficients, and selecting a maximum value from an output of the inverse transform to identify the peak ground acceleration for a position along the at least one optical fiber.

A method of determining a peak ground acceleration includes providing a DFOS instrument connected to at least one optical fiber and recording DFOS data with the DFOS instrument. The DFOS data includes strain data along the at least one optical fiber. The method also includes converting the strain data into complex Fourier coefficients, scaling the complex Fourier coefficients, applying an inverse transform to the scaled Fourier coefficients, and selecting a maximum value from an output of the inverse transform to identify the peak ground acceleration for a position along the at least one optical fiber.

Described herein is method for the detection of seismic activity using a network of lights, and in particular, street lights (43) arranged over a number of streets (42). Each light includes a control module having the facility for both long- and short-distance communication, the control modules being grouped with other control modules and associated with a group controller to create a short-distance or mesh network. Each control module includes a sensor which is capable of detecting seismic activity and data relating to such activity may be transmitted to a central server via its group controller using long-distance communication. Even if the sensors are relatively inaccurate, the high number of such sensors present in the network makes it possible to detect and analyze the activity using geocoordinate information provided by the control modules at the server. Information relating to an epicentre of an earthquake can be determined and distributed to control modules in the vicinity of the detected seismic activity (50) to provide warning light signals for the population in that vicinity.

An automatic inspection and monitoring method based on time domain slotting control, belonging to the technical field where the field personnel can automatically inspect and monitor a field device of a seismic apparatus in the seismic exploration production. A method of extraction and transmission of a seismic apparatus host on the information of a field device is implemented by a master control program, test information about the seismic apparatus host on the field device can be automatically extracted and classified from the seismic apparatus host, and according to a designed push protocol, a protocol encoding is conducted; a data frame block is automatically generated; and then the information is delivered via a broadcasting station; an encoding protocol of information push is designed for avoiding information loss caused by signal instability, etc. during information push. According to the protocol, the state information on the field device is encoded to generate a data frame block. There is no more need in the present invention for the operating personnel of the seismic apparatus to read and broadcast the content of the field device item by item, and it only needs to set a software operation mode, so that the automatic extraction and transmission of the state information on the field device can be extracted and transmitted.

A method for forecasting an environmental event/a type of environmental event includes acquiring at least one test data set of at least one behavioural and/or physiological parameter of a population of animals; generating a test profile based on said at least one test data set, representing behaviour and/or physiological status of the population of animals; calculating a ratio between the test profile and a first reference profile; and setting an alert, if said ratio reaches a predefined threshold value.

An earthquake detection system includes an earthquake data receiving module, for receiving a plurality of earthquake data and generating an earthquake parameter according to the plurality of earthquake data; a threshold value setting module, for setting an earthquake threshold according to the earthquake parameter; and an earthquake detector, for determining whether a new earthquake data belongs to an earthquake event according to the earthquake threshold when the new earthquake data is received, in order to generate a determination result; wherein the threshold value setting module further adjusts the earthquake threshold according to the determination result.