Property, Plant and Equipment

12 Months Ended

Sep. 30, 2014

4.	Property, Plant and Equipment

Property, plant and equipment, together with the related estimated useful lives, were as follows:


	September 30,
	2014			2013			Useful Lives
Land, building and other	$	13,848,000		$	10,822,000			3 to 40 years
Recording equipment		206,517,000			197,134,000			5 to 10 years
Line clearing equipment		1,084,000			937,000			5 years
Vibrator energy sources		78,119,000			80,309,000			5 to 15 years
Vehicles		36,730,000			35,623,000			1.5 to 10 years
Other(a)		1,624,000			639,000			—

		337,922,000			325,464,000
Less accumulated depreciation		(173,428,000	)		(152,231,000	)

Net property, plant and equipment	$	164,494,000		$	173,233,000

(a)	Other represents accumulated costs associated with equipment fabrication and modification not yet completed.

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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