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1990年7月16日当地时间16时26分,新加坡以吕宋岛为中心,发生了7.8级地震(震中在圣约瑟下以东22公里,距地面33公里)。由于建筑物倒塌(约十万多户)、山岩滑坡及道路下陷,死伤人数约2000余人,造成经济损失估计在2亿美元以上。应新加坡政府邀请日本派员进行了水利设施的破坏情况调查及修复对策的研究。受害最多的是渠道工程,打拉地区的打拉河灌溉系统(Taris)中,干渠下游多被损坏,渠道砼衬砌由于地震产生填方沉陷而滑落。位于震中附近的Pantabangan坝,1974年建成,坝高107米,库容30亿立米,主体坝全长1600米,堆石坝上游面为30厘米厚砼板。据推算最大加速度在300gal以上,坝顶下沉25厘米,砼板接缝被拉开。位于下游的Masiway坝,为发电用反调节水库,坝高25米,坝长430米的堆石坝,坝上游面滑塌,坝顶与溢洪道接合部位最大下沉1米,损害较为严重。由于地震引起山崩,及一周后发生台风,Dipalo的二座取水坝淤积厚达8米以上。其他放水设施、桥梁、道路、农田也多有损坏。
On July 16, 1990, at 16:26 local time, an earthquake of magnitude 7.8 struck Singapore as the center of Luzon (epicenter was 22 km to the east under San Jose and 33 km to the ground). Due to the collapse of buildings (about 100,000 households), landslides and road sags, the number of deaths and injuries is about 2,000, causing economic losses of more than 200 million U.S. dollars. At the invitation of the Singapore government, Japan dispatched personnel to carry out a survey on the damage to the water conservancy facilities and a study on the remedial measures. In the Taris, the most affected area is the channel project. In the Taris, the downstream of the main channel is mostly damaged, and the concrete lining of the canal slips due to the subsidence caused by the earthquake. Located in the vicinity of the epicenter Pantabangan dam, built in 1974, the dam height of 107 meters, storage capacity of 3 billion cubic meters, the main dam length of 1,600 meters, the upstream face of rockfill dam 30 cm thick concrete plate. It is estimated that the maximum acceleration at 300gal above, crest 25 cm, concrete slab was opened. The downstream Masiway Dam is an anti-adjustment reservoir for power generation. The dam is 25 meters high and the rockfill dam with a length of 430 meters has a slippery slope. The junction between the dam crest and the spillway sinks up to 1 meter, causing serious damage. As a result of the landslide caused by the earthquake and the typhoon one week later, the second dam of Dipalo silted up to 8 meters in thickness. Other water facilities, bridges, roads, farmland are also more damaged.