Need an Explanation on Spike of Page Views

The last five days my stats on page views in one of my blogs spike again from average of 150 page views per day to over 5,500. Is this for real? This has recurred three times in the last two months. The first time, the spike occurred in my four blogs and the increase in audience came from Germany. Two weeks later the spike occurred only in two of my blogs and again the page views audience again was observed in Germany. Is this from a robot? Please help me explain this unusual spike in page views.

Here are the page views numbers:http://marinduquemyislandparadise.blogspot.com

July 27-126, July 28-260, July 29-5,367, July 30-5,923, July 31-4,727, August 1-5,023, August 2-6,536 and then on August 3-it stabilized to 509.

Here are some of the Referring URLs and sites:

https://www.google.com.ph/

http://flf-course.com/?a_aid=517d032416eac

http://www.vampirestat.com

http://marinduquemyislandparadise.blogspot.com/

http://www.vampirestat.com/

http://www.google.com/search

http://www.adsensewatchdog.com

http://www.google.com

Referring Sites

www.google.com.ph, www.google.com ,www.vampirestat.com, flf-course.com, and marinduquemyislandparadise.blogspot.com