Recent  

A reference corner cube inertial suspension device(RCCISD) was developed, which is used to measure the vibration acceleration of the reference corner cube of the laser interferometer absolute gravimeter. The test results show that the PSD of gravitational acceleration is about 40 dB lower than that of the reference prism directly placed on the ground. The volume of the RCCISD is about 1 / 3 of the Super-Spring volume, which can greatly reduce the height of the gravimeter.

InSAR is vital for monitoring slope instabilities but requires understanding. This paper delves into differences between satellite and GB-InSAR, addressing geometry and acquisition. It offers a user-friendly tool to determine the best GB-InSAR installation location, considering various technical, meteorological, and topographical factors, streamlining the campaign setup.

Manual chambers for soil respiration monitoring can be cost-effective yet rather accurate. The described chamber is relatively low-cost and entirely built from commercial parts, which makes it very accessible for almost everybody. Our chamber is robust, simple to operate, and very suitable for a large-scale punctual campaign as well as for educational purposes. Oxygen sensors bring some more insights into our soil respiration understanding.

We developed a serialized mall-diameter hydraulic fracturing in-situ stress measurement system, which enables series measurement of small-sized boreholes for in-situ stress, and has the advantages of simple and lightweight structure, short testing time, high success rate, and low requirements for rock integrity and pressurization equipment. This system has important practical value and economic significance in accurately determining the in-situ stress state of deep development areas.

We developed a novel flexible measurement array for deep-seated landslide displacement and measurement process, enabling higher accuracy in full-hole multi-dimensional deformation measurement. The measurement array consists of individual measurement probes as basic units, connected in series through coaxial cables and high-pressure rubber hoses, forming a flexible measurement array. It provides a more comprehensive and improved monitoring tool for disaster prevention and mitigation.

Heat storage in the soil is difficult to measure due to vertical heterogeneity. To improve measurements we designed a 3D-printed probe that uses fiber-optic distributed temperature sensing to measure a vertical profile of soil temperature. We validated the temperature measurements against standard instrumentation. With the high resolution data we were able to determine the thermal diffusivity of the soil at a resolution of 2.5 cm, which is much higher compared to traditional methods.

Data recorded with transient electromagnetics are typically gated to improve the signal-to-noise ratio. Gating corresponds to lowpass filtering of data with the shape of the gate giving the frequency response. We show that standard gate shapes can lead to significant correlation between gates caused by distortion from VLF radios. A multi-objective cost function is used to select optimum gate shapes with less influence from radio noise. Performance is demonstrated using synthetic and field data.

We present experimental results of a new copper-based alloy suitable for use in high-precision magnetic sensing. It out-performs the current state of the art by providing lower magnetic noise and superior power consumption. Prototype sensors constructed from this material can meet an exacting standard, the 2012 1-second INTERMAGNET standard, for magnetic observatories.

This research note demonstrates that a Raman spectrometer using the camera present in modern day cellphone can record in-situ Raman spectra of various minerals of geological importance. This allows almost anyone to be able to record Raman spectra at a very low cost.

Much of the world relies on groundwater as a water resource, yet it is hard to know when and where rainfall replenishes our groundwater aquifers. Caves, mines, and tunnels that are situated above the groundwater table are unique observatories of water transiting from the land surface to the aquifer. This paper will show how networks of loggers deployed in these underground spaces across Australia have helped understand when, where and how much rainfall is needed to replenish the groundwater.