Joseph Nyago

Seismological NetworkSeismological Network

Department of Geological Survey and Mines, Department of Geological Survey and Mines,

P.O Box 9, Entebbe - UgandaP.O Box 9, Entebbe - Uganda

An overview of Uganda Seismological Network An overview of Uganda Seismological Network and current activitiesand current activities

IRIS Workshop on Managing Waveform Data and Related Metadata for Seismic NetworksIRIS Workshop on Managing Waveform Data and Related Metadata for Seismic Networks’’, November 8-16, 2009 in Helwan - Cairo, , November 8-16, 2009 in Helwan - Cairo, EgyptEgypt

OutlineOutline

IntroductionHistory of destructive earthquakes in UgandaEarthquake epicenters 1900-2007Station coverageSeismic instrumentationData collection, analysis and interpretationWay forwardAcknowledgements

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

IntroductionIntroduction

Seismological monitoring activities in Uganda as early as 1925 with a Milne-Shaw seismograph station at Entebbe. It was later re-established in 1989 under Uganda National Seismological Network.

UNESCO donated 3 micro-earthquake (MEQ-800) analogue seismograph and short period seismometers.

In 1999, the US Government through University of California San Diego (IRIS-IDA Project) installed a Global Seismographic station (MBAR) at Kyahi-Mbarara.

In 1999, International Programs in Physical Sciences (IPPS), Sweden donated 3 Orion Nanometrics seismographs and broadband seismometers.

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

History of destructive earthquakes in History of destructive earthquakes in UgandaUganda

9th July 1912: Kitgum earthquake, magnitude 6.7;

2nd October 1929: Toro earthquake in western rift, magnitude 5.9;

18th March 1945: Sembabule earthquake, magnitude 6.0;

20th March 1966: Toro earthquake, magnitude 6.6;

7th September 1990: Lake Victoria earthquake, magnitude 5.0;

9th October 1991: Butiaba Port earthquake, magnitude 5.3;

5th February 1994: Kisomoro earthquake, magnitude 6.2 (8 people lost lives, caused destruction of property in 3 western districts worth 61 million US dollars).

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

Earthquake epicenters 1900-2007Earthquake epicenters 1900-2007

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt VSAT antenna at site NDC-N180

Seismic Network Seismic Network

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt VSAT antenna at site NDC-N180

SeismicSeismic InstrumentationInstrumentation

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

Station (name/code)

Equipment installed Data collection/availability

Mbarara, MBAR CTBTO-IMS (AS103)

• 3-Component BB sensor, • 3-Strong Motion sensor, • Accelerometers

VSAT terminal ,USB Memory, AutoDRM.

Entebbe, ENTT

• Short Period (vertical) sensors, MEQ-800 Sprengnether seismograph.

• 3 Component BB (CMG-40T) sensor, Orion digital Nanometrics (portable) seismographs

Paper seismogram and phase reading and picking.

Data disc (2GB) and manual download to PC

Hoima, HOI

• Short Period (vertical) sensors, MEQ-800 Sprengnether seismograph.

• 3 Component BB (CMG-40T) sensor, Orion digital Nanometrics (portable) seismographs

Paper seismogram and phase reading and picking.

Data disc (2GB) and manual download to PC

Kilembe, KIL

• Short Period (vertical) sensors, MEQ-800 Sprengnether seismograph.

• 3 Component BB (CMG-40T) sensor, Orion digital Nanometrics (portable) seismographs

Paper seismogram and phase reading and picking.

Data disc (2GB) and manual download to PC.

VSAT antenna at site NDC-N180 Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

SeismicSeismic InstrumentationInstrumentation

SeismicSeismic InstrumentationInstrumentation

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

Data collection, analysis and Data collection, analysis and interpretationinterpretation

Seisan earthquake analysis software ( both linux and windows versions) is used to analyze waveform data from the IRIS station (MBAR) and waveform data from 3-component broadband (nanometrics) stations (ENT, HOI, KIL).

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

Way forward ??Way forward ??

• Upgrading the existing stations with improved event detection capability and modern instrumentation to ensure;

Real-time waveform data transmission and availability Automatic waveform processing Automatic event location

• Expanding on the existing network by increasing on the number of stations to ten (10) to ensure accurate event location.

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

AcknowledgementsAcknowledgements

• UNESCO

• Incorporated Research Institutions in Seismology (IRRS)

• University of California San Diego (UCSD)

• International Programs in Physical Sciences (IPPS)

• AfricaArray (AA)Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

EndEnd

Thursday, April 20, 2023IRIS Workshop, Cairo-Egypt

I Thank You All For Your I Thank You All For Your Attention!Attention!