UJI GETARAN SEISMIK PADA RANCANG BANGUN REAL TIME SEISMIC MEASUREMENT (RSAM) MENGGUNAKAN FAST FOURIER TRANSFORM (FFT)

Indonesia is one of the countries with the most volcanoes in the world. Observation, monitoring, recording, dissemination of information and warning of danger signs for volcanic activity is one of the focuses in the response to volcanic disasters. The instrument used to monitor volcanic activity is Real-time Siesmic Amplitude Measurement (RSAM). RSAM is a system that provides a continuous measurement of the seismic amplitude of the absolute average of the number of seismic stations. RSAM occupies a strategic role in monitoring volcanic seismic activity, especially in times of crisis before the eruption. In this study designing RSAM systems using geophone sensors to detect seismic vibrations. System testing is done by varying the test frequency. The test frequency given starts from 10 Hz to 50 Hz. The results of this study indicate that a system that has been designed to build can detect vibration signals well. This is evidenced by the Fast Fourier Transform (FFT) spectrum which shows the suitability of the test frequency with the spectrum peak produced.

RANCANG BANGUN SISTEM PENANGKAP DAN PEMBACAAN GELOMBANG SEISMIK REFRAKSI UNTUK EKSPLORASI HIDROKARBON

The subsurface data acquisition in seismic eksploration usually using expensive equipment. In this work, a low-cost seismic equipment system has been developed for receive and record seismic wave. This system consist of mikrocontroller and software LabView that connected to PC. The subsurface low signals is recorded by geophone and through the amplifier instrument non-inverting. Then, the digital signals is prosessed by Mikrocontroller and visualize by LabView. Output of seismic measurement using this system design are travel time and amplitude. Travel time is used to modelling density and wave velocity to generate wave model. The expected model can give us value of density and wave velocity to obtain the anomaly. It has been tested using 1 geophone and successfully showed the wave, amplitude, and travel time.

Seismic Measurement of Management Accounting Innovations: Using the Scale of Innovation Intensity

The purpose of this paper is to determine the intensity of the contribution of Balanced Scorecard (BSC), Activity Based Costing (ABC), and Lean Accounting (LA) have had in the academic literature. An approach that is derived from Seismic measurement of earthquakes is adopted to produce what has been labelled the Scale of Innovation Intensity model. The three innovations were found to have measures of intensity that fall within the medium level of intensity. The findings support the arguments that the three management accounting innovations have had an influence on the direction of management accounting. This paper also provides a general overview of the application of the scale of innovation intensity and its potential for future research.

Volcanoes in Italy and the role of muon radiography

Cosmic-ray muon radiography (muography), an imaging technique that can provide measurements of rock densities within the top few 100 m of a volcanic cone, has now achieved a spatial resolution of the order of 10 m in optimal detection conditions. Muography provides images of the top region of a volcano edifice with a resolution that is considerably better than that typically achieved with other conventional methods (i.e. gravimetric). We expect such precise measurements, to provide us with information on anomalies in the rock density distribution, which can be affected by dense lava conduits, low-density magma supply paths or the compression with the depth of the overlying soil. The MUon RAdiography of VESuvius (MURAVES) project is now in its final phase of construction and deployment. Up to four muon hodoscopes, each with a surface of roughly 1 m 2 , will be installed on the slope of Vesuvius and take data for at least 12 months. We will use the muographic profiles, combined with data from gravimetric and seismic measurement campaigns, to determine the stratigraphy of the lava plug at the bottom of the Vesuvius crater, in order to infer potential eruption pathways. While the MURAVES project unfolds, others are using emulsion detectors on Stromboli to study the lava conduits at the top of the volcano. These measurements are ongoing: they have completed two measurement campaigns and are now performing the first data analysis. This article is part of the Theo Murphy meeting issue ‘Cosmic-ray muography’.