Month: February 2014

Local skewness attribute

February 15, 2014 Documentation No comments

A new paper is added to the collection of reproducible documents:
Local skewness attribute as a seismic phase detector

We propose a novel seismic attribute, local skewness, as an indicator of localized phase of seismic signals. The proposed attribute appears to have a higher dynamical range and a better stability than the previously used local kurtosis. Synthetic and real data examples demonstrate the effectiveness of local skewness in detecting and correcting time-varying, locally-observed phase of seismic signals.

Madagascar school in St. Petersburg

February 11, 2014 Celebration No comments

A Madagascar school will take place on April 11, 2014, in St. Petersburg, Russia, at a workshop during the EAGE convention. The workshop was proposed by Paul Sava.

See the workshop page for more information.

Program of the month: sfdipfilter

February 6, 2014 Programs No comments

sfdipfilter filters input data based on a range of dips (slopes).

The following example from rsf/su/rsfdipfilt (borrowed from one of Seismic Unix demos) shows a synthetic dataset with three events before and after dip filtering:

sfdipfilter operates in 2-D or 3-D Fourier transform domain, with the dimensionality specified by dim=. The dip range is specified either by angles (if angle=y) or by velocities (if angle=n). The four parameters (either ang1=, ang2=, ang3=, ang4= or v1=, v2=, v3=, v4=) specify the range. If pass=y, the range between v2 and v3 is passed, and the range below v1 or above v4 is rejected. If pass=n, the range between v2 and v3 is rejected, and the range below v1 or above v4 is passed. The transition between pass and reject regions is implemented with a sine tapering.

10 previous programs of the month