ArcGIS contours creation using ArcPy

I have a raster on ArcGIS and I want to add some contours. I use the ArcPy library to do that. This is the raster (part of a country) and the contours:

This is the raster with the contours:

and this is the same image, zoomed:

I am trying to do the same like the image below:

But the contours that are created are not in the shape I imagined. I just have a raster with different values and I want to add contours like in the last image.

Is there any tool that I can do that? In my script I use the simple arcpy.sa.Contour command. I just want to add contours of ground acceleration around an epicenter.