I have just discovered a document: A Catalogue of Violent Earthquakes in the Philippine Islands. Available on Project Gutenberg, with an appendix on earthquakes in the Mariana Islands. This is a rude awakening.
The great Surigao Earthquake of 1879
Location: Philippines: Nw Mindanao: SurigaoDate and Time: 6/30/1879 at Midnight, 38 minutes
MMI Int: 10
Financial Damage (Approx. Damage): (More than 25) Millions of Dollars
I cannot remember an EQ of an intensity of 10.
For a map: