December 19, 1928 Earthquake: Cotabato,n Coast of Illana Bay, Philippines

Reference #414:

1928, December 19 (mistakenly 28), 19:37 [local time]. There was a strong earthquake which affected all Mindanao Island. Many homes collapsed at Cotabato. Zamboanga and Davao did not suffer, although the tremors were very strong. A tsunami was observed in Ilana Bay. A wave rose up the Mindanao River to Cotabato, where it did damage. Four people died and 102 were injured. Gutenberg, Richter (1954): 19.XII; llh37mlOs; 7 N., 124 E, magnitude 7.3.

Reference #1187:

1928, December 19, 7:39 p.m. [local time]. SW. Cotabato: Cotabato - earthquake of Intensity vII. Surrounding area within a radius of about 80 kms - Intensity VI... The town of Cotabato suffered most in its buildings; it was certainly the nearest town to the E of the epicentre but the main cause responsible for the numerous ruins was the poor condition of the buildings, most of them badly constructed and the rest old and in bad repair. These conditions were aggravated by the soft and swampy nature of the soil along the river bank. Cotabato was once upon a time a swamp. Only a few sections are solid ground and the rest filled with sand and other light materials. Most of the houses are built over this filling, that is why so many houses fell down; whilst, in nearby places where there is firmer ground, light structures withstood the shocks. Up the river, ruins occurred on its banks and in small islets in the swamps and lakes. Its epicentre was located in the NE part of the Celebes Sea. The quake hit Cotabato killing 93 persons; hundreds rendered homeless. The greatest sufferer from the quake was Cotabato where all the old buildings were razed to the ground. Those that remained standing were considered dangerous to live in and people for a time put up temporary shelters in the open.

Reference #88:

1928, December 19, 11:37:10 UTC, 7 N, 124 E, shallow depth, magnitude 7.3 MS.

Reference #1058:

1928, December 9. Intensity VII. Cotabato and Zamboanga. Violent.

Reference #10476 (v 12.1):

1928-12-19 11:37:19.40 UTC, magnitude 7.42 Mw