Seismic Monitoring of Poland–Description and Results of Temporary Seismic Project with Mobile Seismic Network

Abstract

A b s t r a c tThe paper describes a temporary seismic project aimed at developing the national database of natural seismic activity for seismic hazard assessment, officially called "Monitoring of Seismic Hazard of Territory of Poland" (MSHTP). Due to low seismicity of Poland, the project was focused on events of magnitude range 1-3 in selected regions in order to maximize the chance of recording any natural event. The project used mobile seismic stations and was divided into two stages.Five-year measurements brought over one hundred natural seismic events of magnitudes M L range 0.5-3.8. Most of them were located in the Podhale region in the Carpathians. Together with previously recorded events this made it possible to conduct a preliminary study on ground motion prediction equation for this region. Only one natural event, of magnitude M L = 3.8, was recorded outside the Carpathians in a surprising location in central-west Poland.

Studies of Historical Earthquakes in Southern Poland

“…Seismic monitoring carried out by the Institute of Geophysics, Polish Academy of Sciences, along the PKP in Podhale revealed constant seismic activity: over 100 seismic events of magnitudes 0.5 ≤ M L ≤ 2.3 have been recorded over a period since August 2008 until December 2012 (Trojanowski et al 2015). Completeness of the seismic catalogues and probability of magnitude exceedance was studied by Plesiewicz and Wiszniowski (2015, this issue).…”

“…The stations' sites were determined after detailed analysis of historical seismic activity. The MSHTP project administered 24 seismic stations over a period of 5 years in two stages (Trojanowski et al 2015). In the first stage of the project, since mid-2008 to mid-2010, the measurements were made in southern Poland, with special attention to the Western Carpathians.…”

“…Likewise the events along the PKP, the foci were of shallow depths, less than 5 km. It is supposed that the earthquakes originated in the flysh complex or in the border area of the metamorphic basement.During the seismic monitoring carried out in the region since August 2008 until December 2012, four events were recorded, of magnitude 0.9 ≤ M L ≤ 2.0(Trojanowski et al 2015; Plesiewicz and Wiszniowski 2015, this issue). On April 1, 2014, an earthquake of M L = 2.8, followed by 3 aftershocks during next 2 days, was recorded near Szczawnica just at the border area of the PKP and Beskid Sądecki Mts(Plesiewicz and Wiszniowski 2015, this issue).Beskid Niski Mts.…”

Preliminary Results of Anthropogenic Seismicity Monitoring in the Region of Song Tranh 2 Reservoir, Central Vietnam

“…Seismic data from server in Hanoi is transmitted to Warsaw where waveforms are stored on a RAID matrix. The whole system combines earlier solutions (Lizurek et al 2013, Trojanowski et al 2015. It allows visualizing data in real time, saving and studying them as well as monitoring and controlling the data acquisition system.…”

Some Characteristics of Seismic Activity in the Song Tranh 2 Reservoir, Quang Nam, Vietnam by Local Seismic Network Data

“…The completed catalogues were estimated on a frequency-magnitude distribution (FMD) of detected events in the selected region as well as by techniques [19]: Maximum Curvature (MAXC) [27], Entire Magnitude Range (EMR) [25,28] and study of the b-value stability of Gutenberg-Richter model [13] as a function of cut off magnitude (MBS) [5].…”