The 2014 Mw 6.1 Ludian Earthquake: The Application of RADARSAT-2 SAR Interferometry and GPS for this Conjugated Ruptured Event

Round 1

Reviewer 1 Report

Revision of “The 2014 Mw 6.1 Ludian Earthquake: The Application of RADARSAT-2 SAR Interferometry and GPS for this Conjugated Ruptured Event” by Niu et al.

General Comments:

I’m not an expert on this topic, but I found very interesting the paper, overall the discrimination if the Ludian earthquake released or not the whole accumulated stress, that is a crucial point.

How can be the maximum slip at the surface of 1.6m and the surface displacement didn’t overpass 0.82m (square sum of horizontal and vertical displacement)?

After a revision I suggest the paper to be published in Remote Sensing.

 

Specific points:

Page 1, Line 27. Could you better describe the difference of depth of main slip (0-5 km) and aftershocks deeps (5-20 km). Apparently even it they are close they don’t superpose…

Figure 1. I suggest adding the fault name as in Figure 2b, because it would be easier to read the paper and your description in the manuscript.

Table 1. I noticed that the data of USGS are not the best available at present, so please update it. Magnitude 6.2 (6.16), localization: 103.409°E, 27.189°N, Np1: 338°/74°/-32°, Np2: 77°/59°/-162°.

Page 3, line 112 – I suggest rewriting little different separating the two sentences, for example: …XF0W2 beam mode: Extra Fine Mode. Extra-Fine Resolution Beam Mode nominally provides…

Figure 3 (a) Is it a moment magnitude scale or simply a Magnitude scale as for the smaller event I mean it is not possible to calculate the tensor, right?

Page 8. Line 244 – 0.15, please insert the unit of measurement. I think 0.15m.

Page 8 line 262 – I think “decreased” is better than “deceased”.

In the whole paper is written N.m for the unit of the seismic moment tensor, please replace the dot N∙m

Author Response

Please see the attachment, thanks.

Author Response File: Author Response.docx

Reviewer 2 Report

I think, in general, the manuscript is OK. I only have two minor revisions considering GPS and InSAR data.

 

In Figure 2. Where is the legend indicating the amount of GPS deformation?

 

Line 122. Orbit data of current satellites are very accurate. The errors usually don’t lead to visible residual fringes in the interferograms.  What you see is likely because of atmosphere including troposphere and ionosphere, especially ionosphere since 2014-2015 was nearly at solar maximum and your region is near equator.

Author Response

Please see the attachment, thanks.

Author Response File: Author Response.docx