Summary and Conclusions
  1. There is a close relationship between seismic disturbances and geological structure.

  2. The majority of earthquakes are of tectonic origin, in the Philippines at least.

  3. Volcanoes are secondary phenomena.

  4. The area of greatest seismicity in the Archipelago is in the Agusan Valley, Mindanao.

  5. There is a close relationship between seismic disturbances and geomorphic lines and the lines connecting the principal epicenters in the Archipelago.

  6. Seismic disturbances can be studied, and disasters can, to a large extent, be avoided.

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