Maintenance of CRONOS temporary seismic stations

Apr 12, 2023 | News

As part of fieldwork from 28 February to 3 March 2023, we visited several temporary seismological stations of the CRONOS project where problems had previously been recorded – HR05A (Vinovac), HR06A (Nisko), HR07A (Vučipolje) and HR10A (Slivno). Additionally, we visited the island of Mljet to survey a potential location to install a seismological station as part of the DuFAULT project, where the instrument was ultimately installed. 

We left from the Department of Geophysics of the Faculty of Science on Tuesday, 28 February 2023, at 8:30 am. The team involved in this fieldwork included Josip Stipčević, Helena Latečki, Lucija Golub, and later on the first day, our colleague from Norway, Stephane Rondanay, joined us. We first visited the temporary seismological station HR06A in the town of Nisko (municipality of Klis). There were previous communication problems, so we reconfigured the router upon arrival. We restarted the router and checked the other station components. Everything seemed to be in order, and the data was being sent to the server in Zagreb as expected. After Stephane joined us, we went to inspect the seismological station HR05A in the town of Vinovac. After several unsuccessful attempts and the replacement of a blown fuse in the breakout box, we discovered that the sensor, digitizer, and breakout box had blown. We need to revisit the location and install new sensor, digitizer and breakout box. 

On Wednesday, 1 March, we headed to the town of Slivno, where a temporary seismological station HR10A was installed in a local school. The problem there was with the digitizer. Stephane brought a new digitizer that we installed in place of the old one, and everything continued to function properly. We copied the previously recorded data from the hard drive and configured the new digitizer. After verifying that the data was being sent to the server in Zagreb as expected, we held a lecture for the students and teachers at the school to encourage interest in science, in agreement with the school principal Antonela Filipović. Afterward, we went to a hotel in Opuzen, where we stayed for two nights. 

On Thursday, 2 March, we left early in the morning and took a ferry to the island of Mljet. On Mljet, we surveyed a potential location in the town of Maranovići to install a new seismological station (DF06) as part of the DuFAULT project. The location seemed suitable, so we installed a Nanometrics Centaur digitizer and sensor. Everything appeared to be fine, but we were unable to establish communication with the station, and data was not being sent to the server in Zagreb. The data will be copied and used in further analysis of the DuFAULT and CRONOS projects. It is necessary to visit the station again with the SIM card of a new mobile operator that has better signal coverage in Maranovići. 

On Friday, 3 March, we went to station HR07A in the town of Vučipolje (Hrvace municipality), where telecommunication problems had been reported earlier. Immediately upon the first inspection of the station, it was noticed that the digitizer did not light up, and only 30 minutes of data had been recorded on the hard disk since the installation. After inspecting all the components of the station, it was determined that the problem was in the power cable. The cable did not work at all, so we immediately replaced it. We found that everything else was in order and that the data was being sent to the server in Zagreb. After work at station HR07A was finished we headed for Zagreb. 

Prepared by Lucija Golub