DOI: 10.5281/zenodo.17397865
title: Raw continuous gravimetric dataset (2023–2024) recorded at the Campi Flegrei caldera

description: This dataset reports the gravity acquisition (2023-2024) recorded by the relative gravimeter, model gPhoneX#116, located inside the “Oasi WWF” building of the Astroni crater (Campi Flegrei caldera, Italy).

Station coordinates are as follows:

Latitude (WGS84): 40.840085 ° NLongitude (WGS84): 14.159128 ° EElevation: 101 m a.s.l.

The files are provided in the “.tsf” format, a “text-oriented format” in use by the TSoft software (Van Camp and Vauterin, 2005). A detailed description of the format is given in the manual of the software (https://seismologie.oma.be/en/downloads/tsoft). Each file contains daily recordings at a sampling frequency of 1 Hz of raw gravimetric data in microGal (1 Gal = 10⁻² m/s²) and 19 more channels with auxiliary data (i.e. atmospheric pressure, ambient temperature…).

A header, identified as [COMMENT] in the tsf file, reports the relevant acquisition parameters and calibration constants that, for instance, allow to convert tilts from AD Units to physical Units.

Each file contains the following 20 channels:



Gravity (µGal): raw gravity record

Corrected Gravity (µGal): gravity corrected for tidal effects according to ETGTAB, ocean tide loading, atmospheric pressure effect (-0.3microGal/mbar);

Tide (µGal): Tide effects predicted at the site according to ETGTAB;

Long Level (LL, AD Units): value of the long level in AD Units. Conversion to physical units can be done using the Long Level Calibration Factor (k, provided in rad/ADU) and Long level set-point (sp in rad) in the header of each file. In particular, AD units are converted to radians by means of the following equation: LL*k+sp 

Cross Level (AD Units): value of the cross level in ADU. Conversion to physical units can be done using the Cross Level Calibration Factor in the header of each file. The procedure uses the same equation as LL;

Ambient Temperature (°C);

Sensor Temperature (°C) temperature variations inside the chamber hosting the core sensor

Ambient Pressure (mbar);

Sensor Pressure (mbar); pressure variations inside the chamber hosting the core sensor

Beam Position (AD Units) position of the beam of the reference mass

Level Correction (µGal) gravity change due to the tilt according the equation reported in the gPhone manual 

Drift Correction (µGal): linear drift correction calculated assuming the drift rate reported in the header section; in our case, for calculating the Corrected gravity, the drift correction is disabled;

Sensor Pressure Correction (µGal): calculated by multiplying Meter Pressure Correction factor times the sensor pressure channel corrected by Meter Pressure Setpoint. In our case, for calculating the Corrected gravity, the correction is disabled;

Barometer Compensation (µGal): pressure correction calculated with a standard admittance of -0.3 microGal/mbar;

Ambient Temperature Correction (µGal): disabled in our case, since the calibration factor for converting ambient temperature changes to gravity has not been determined;

Meter Temperature Correction (µGal): disabled in our case, since the calibration factor for converting meter temperature changes to gravity has not been determined.

Polar Motion Correction (µGal): not calculated and disabled in our case.

Ocean Load Correction (µGal): calculated according to FES2004 model

Velocity (µ/s): time integration of observed Gravity channel (ch. 1)

Position (µ): time integration of Velocity channel (ch. 19)