Seismicity of Moldova Republic. The territory Republic of Moldova is influenced by intermediate depth earthquakes from Vrancea

seismic zone, located in Romania and local weak earthquakes. The strongest of these earthquakes are distributed on the depth

interval 70-200 km, with maximum magnitude 7.5-7.8. The maximum intensity VII-VIII (MSK-scale) is observed in Moldova. On

average, strong earthquakes of magnitude M ≥ 6 occur ten times or more per century. Some of them (November 10, 1940, March 4,

1977, August 31, 1986) caused casualties and considerable damage.

The Center of Experimental Seismology, within the Institute of Geology and Seismology, monitors seismic activity the territory of the

Republic of Moldova.

Mission of the Moldavian Seismic Network :

- Continuous monitoring of the territory of the country by means of modern digital seismic stations, participation in the global

monitoring by transmitting information to international and regional centers;

- Development and completion of numerical data base waveform, catalogs and seismic bulletins;

- Identification of macroseismic effects to determine the intensity of earthquakes with magnitude M≥5:

- Informing of the governing bodies and civil society about seismic events;

- Quick informating time (up to 2 minutes) of Railway of Moldova in order to avoid accidents in rail transport;

- Studying the behavior of typical buildings with seismic instruments;

- Ensuring fundamental and applied research with seismic data, underlying the calculation of seismic risk and development

(improvement) of the aseismic regulation documents for construction in Moldova;

-Seismic education of the population.

The seismic network of Moldova (MSN) consists of 7 seismic stations, situated in Chisinau, Milestii Mici, Leova, Cahul,

Giurgiulesti, Purcari and Soroca. The recorded data by MSN are sent to National Data Center where they are processed the

automatically Seismological Communication Processor SeisComp 3.2 and analyzed by operators. This network consists from digital

seismic stations equipped with different high quality digitizers (Kinemetrics K2,Quanterra Q330, Quanterra Q330S), broadband

sensors (CMG-40T, STS-2, Mark L4) and short period seismometers (ES-T).

The accelerometric network in Chisinau consists of 5 seismic stations equipped with Strong Motion Accelerograph

ETNA Kinemetrics (1), CMG5TD Guralp Systems (4) and is designed to monitor strong Vrancea earthquakes.

Monitoring of Seismic Hazard in Republic of Moldova

International and regional cooperation.

The exchange of data, production and processing

of seismic information IGS cooperates with the

Following foreign organizations:

1. National Institute for Earth Physics, Bucharest,

Romania;

2. URBAN-INCERC, Bucharest, Romania;

3. Institute of Geophisics NAS, Kiev, Ukraine;

4. Centre of Geophysical Monitoring NAS of

Belarus, Minsk;

5. Geophysical Survey of Russian Academy of

Science, Obninsk;

6. Kandilli Observatory and Earthquake Research

Institute, Turkey;

7. European-Mediterranean Centre, EMSC-

CSEM;

8. International Seismological Centre, ISC.

The National Data Center

Seismic Station “Soroca”

Seismic Station “Leova”

Old analog equipment

New digital equipment

INSTITUTE OF GEOLOGY AND SEISMOLOGY http://igs.asm.md

Center of Experimental Seismology Central Seismic Station “Chisinau”

Distribution of earthquake epicentres from

Vrancea region (984-2006)

Earthquakes produced in a.2014 in northern

part Republic of Moldova

Ilies Ion, head of Center, ilies@renam.md, Bejan Octavian ing. energze2004@yahoo.com

№

Name et of

station

Internat

ional

cod

Year of

opening

φ°, N λº, E H, m Depth,

m

1 Chişinău KIS 1949 46.9976 28.8175 185.0

2 Cahul KGL 1978 45.9053 28.2008 48.5

3 Leova LEOM 1982 46.4733 28.2467 20.0

4 Soroca SORM 1983 48.1350 28.3513 60.0

5 Giurgiuleşti GIUM 1988 45.4850 28.2081 62.5

6 Mileştii Mici MILM 2009 46.9180 28.8150 124.0 60.0

7 Purcari PURM 2013 46.5293 29.8722 39

Information on the seismic stations of the Republic of Moldova

Seismic intensity distribution in the territory of

Moldova and Ukraine,

M=5.3 earthquake of 06.10.2013

Seismic Station “Giurgiuleşti”

Seismic Station “Purcari”

Seismic Station “Milestii Mici”

EWS for Chisinau

Numarul de cutremure lunare

produse in aa.2000-2014

Name et international cod of

station

Station type

Sensor type

Recording equipment

Data transfer

Recording

Chişinău

KIS

3C SP ES-T Q330 + PCIV +

SeisComp

Internet Digital - Continuos 3C-BB CMG-

40T

3C SP CMG-5T CMG-5TD (DM-24)

- Event - Triggered

Leova

LEOM

3C SP ES-T K2 + PCIV +

SeisComp

Internet Digital - Continuos

3C-BB CMG-40T

Soroca

SORM

3C SP ES-T Q330 + PCIV +

SeisComp

Internet Digital - Continuos 3C-BB CMG-

40T

Giurgiuleşti

GIUM

3C SP ES-T K2 + PCIV +

SeisComp

Internet Digital - Continuos 3C-BB Mark

L4C

Мilestii Mici

MILM

3C SP ES-T Q330 + PCIV +

SeisComp

Internet Digital - Continuos 3C BB STS2

Purcari

PURM

3C SP ES-T Q330S + PCIV +

SeisComp

Internet Digital - Continuos

3C BB CMG-

40T

Real Time Seismic Network and instrumentation

The Common Seismic Monitoring System Romania – Moldova. In cooperation with colleagues from NIEP Romania, we have installed in 2007 new digital stations which real time recording. NIEP in Bucharest us free allocated three new seismic stations amount of $ 116,000 USD. Also, in collaboration with the same institute we have opened Moldavian National Data Center.

Data from all real-time seismic stations KIS, MILM. LEOM,GIUM, SORM, PURM are send to the Romania Data Center (RO

NDC), and data from 11 romanian real-time seismic stations BUC1, MLR, PLOR, VRI, PETR, TESR, ARCR, BUR01, IAS, TLCR,

EFOR are send to the Moldova Data Center (MOLD NDC). The communication from the digital seismic stations to the MOLD

NDC in Chisinau and RO NDC in Bucharest is perfomed through Internet.

Moldavian Network is contributing to ORFEUS EIDA with data via NIEP

National Data Center and additional products:

Real-time waveform data stored in the memory unit of the MD NDC through software SeisComp 3.2 . For ensuring data

security, data are archived and stored in parallel on a block 2TB external memory.

The SeisComp3.2 software is used for real-time data analysis and processing, also providing automatic event detection,

arrival picking, event location and magnitude calculation. It provides graphical display and automatic location within near real-

time after the local or regional seismic event occurred.

With the help of the soft SeismGram2K v5.1 processing of records of earthquakes is performed.

The software HYPOS was developed by the IGS for localization of the earthquake and determermination of focal parameters -

the basis for the regional catalog of earthquakes.

Based on seismic station "Chisinau" records reports of earthquakes and bulletins every ten days are made.

Daily reports are sent to the Geophysical Survey RAS, Obninsk, and the National Data Centre NIEP Romania.

Bulletins are sent to the International Seismological Centre, Berkshire, UK, in Geophysical Survey RAS Obninsk,

in the Carpathian Experimental Methodical Party Institute of Geophysics NASU, Lviv, Ukraine, in the seismic station

"Simferopol”, Crimea.

For moderate and strong earthquakes macroseismic survey is conducting and the maps of isoseists are compiling.

MD NDC Data Output:

- local/regional discrimination;

- event location and magnitude determination;

- email notification;

- earthquakes bulletins;

- regional catalog;

- maps of isoseists.

National Seismic Network