This paper examines two major areas of geological hazard: the New Madrid Seismic Zone in the central United States and recent volcanic activity in the Philippines and Russia. It reviews the historic 1811–1812 New Madrid earthquakes, their topographic effects, and the rising probability of future large seismic events in a now-densely populated region. The paper then surveys recent volcanic earthquake activity at Taal Volcano in Luzon and the Kamchatkan stratovolcano in eastern Russia, describing ash plume behavior, alert levels, evacuation responses, and the structural characteristics that make each volcano particularly hazardous.
In the wake of recent seismic activity and devastating earthquakes, many people speculate about where the next major earthquake will occur. Most point to the west coast of the United States as the obvious answer. In doing so, we overlook a potentially catastrophic zone of seismic activity known as the New Madrid Seismic Zone, centered near New Madrid, Missouri. Despite its potentially dangerous characteristics, this area is often dismissed because of its mid-continental location. It is, however, important to recognize that large earthquakes have already struck this region and that the probability of another major event increases as time passes.
The New Madrid Fault has produced several large earthquakes; the most significant occurred during 1811–1812. According to historical accounts based on topographic evidence and observed effects, those earthquakes measured more than 8.0 on the Richter scale. Their impact on the landscape was profound: small areas of land were swallowed, new lakes were formed, and the course of the Mississippi River was altered. These findings are consistent with the data documented by the U.S. Geological Survey's Earthquake Hazards Program.
As time passes, the probability of powerful seismic activity along the New Madrid Fault continues to rise. That probability stood at 40% in the year 2000 and is projected to reach an estimated 90% by 2040. During the 1811–1812 sequence, the relatively sparse population of the region kept casualties and property losses low. Today, however, the surrounding area is significantly more populated. Should a comparable earthquake occur now, the resulting deaths and property damage could be catastrophic.
According to the Philippine Institute of Volcanology and Seismology (PHIVOLCS), between April 12 and 19, between 6 and 21 volcanic earthquakes were detected daily at Taal Volcano in Luzon. Some of these earthquakes were felt by local residents, resulting in slight structural damage to nearby buildings. The alert level — measured on a scale of 0 to 5 — remained at Level 2 throughout this period, and approximately 2,000 residents were evacuated from the town of Taal. The evacuation was driven in part by the volcano's turbulent history; Taal is widely recognized as one of the Philippines' most active and dangerous volcanoes.
Although Taal Volcano is dangerous, it is not topographically prominent or visually imposing. According to PHIVOLCS, the majority of Taal's eruptive area is submerged beneath a surrounding lake. Powerful historical eruptions have caused many deaths, keeping residents in the surrounding area in a state of constant vigilance regarding volcanic activity.
"Ash plumes, thermal anomalies, and Mount St. Helens comparison"
Both the New Madrid Seismic Zone and the active volcanoes of the Pacific Rim illustrate that geological hazards extend well beyond the regions most commonly associated with earthquakes and eruptions. The rising earthquake probability along the New Madrid Fault, combined with significant population growth in the surrounding region, makes preparedness essential. Similarly, the ongoing activity at Taal and the Kamchatkan volcano serves as a reminder that seismic and volcanic monitoring by agencies such as PHIVOLCS and KVERT plays a critical role in protecting lives and property.
You’re 69% through this paper. Sign up to read the remaining 1 section.
Sign Up Now — Instant Access Already a member? Log inAlways verify citation format against your institution’s current style guide requirements.