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Following the granting o a Mineral

Prospecting Licence to Bord Gis rom

the Department o Enterprise, Trade andInvestment or Northern Ireland, a consortium

comprising BGE (Northern Ireland) and Storengy

intend to carry out a 2D seismic study in the Larne

Borough Council area.

The ollowing inormation is a step-by-step guide as to what is involved in a 2D survey.

What is a

2D Seismic

Study?

1 Accessing and clearing the land

Access to survey land will be agreed between the

consortiums Agricultural Liaison Ocers and each

landowner. Only where absolutely necessary and

with the landowners agreement will any boundary

clearance be carried out. All reinstatement required

will be carried out to the landowners satisaction.

Just before the seismic survey begins, it is necessary to determine the depth of the basalt bedrock. To do so, probes

(spikes) are inserted into the ground and connected by a cable. A small current is passed through the probes and the

voltage drop is measured.

2 Receiving seismic data

The lines are then laid or the seismic survey which

will be 5 - 9 kilometres (approximately 3 - 51/2 miles)

long stretching across the countryside. Co-ordinates

are marked and geophones (microphones) are

placed about 10 metres (approximately 32.5 eet)

apart and linked by cables. The geophones record

sound waves refected o the various subterranean

layers, which are then recorded.

Geophone and cabling equipment

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Specialist vehicles and equipment will be used duringthe drilling process

3 Drilling

Terrain-appropriate vehicles will drill small holes

parallel to the cables and geophones. The holes will

be around 8cm / 3 in diameter and will be between

10 - 25 metres (approximately 32.5 82 eet) deep,

dependent on the local depth o the basalt bedrock.

The specialist survey teaminspect the drill holes andplace the sound charges

One of the specialist buggy-mounted vibrator units thatwill travel on main roads

5 Analysis of data

The data will be recorded in a

specialist unit or analysis byexperienced geologists and

geo-scientists.

Seismic data is recorded frombeneath the earths surfacefor analysis

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4 Generating sound waves

Small sound charges are placed in the drilled holes and detonated to create a sound wave that will travel through the

ground and refect o the various sub-terrain strata. In a small number o locations, vibroseis vehicles will travel across

roads generating similar sound

waves through the ground.