Isochron

Development Geology Reference Manual
Series	Methods in Exploration
Part	Geophysical methods
Chapter	Mapping with two-dimensional seismic data
Author	I. R. Gordon
Link	Web page
Store	AAPG Store

Time interval (or isotime or isochron) maps are commonly used for interpreting changes in thickness between interpreted horizons (Figure 1). To map time intervals, calculate the difference in time (normally two-way time) between two events at each shotpoint and contour the resultant values.

Figure 1 (a) Block diagram showing the time that Is mapped for a time slice map. (b) Interval that is mapped on time interval map. (c) Time interval map.

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