With man made earthquake destructive high magnitude earthquakes can be prevented. Yes Fire safety precaution and Health issue are there alongside many other issues in Bangladesh. Though, the major prominent issue is the larking Earthquake in Bangladesh.
Before I wrote few years ago about imminent earthquake threat in Dhaka Bangladesh by 3 tetronic plates. New research showing that Bangladesh sits on a juncture of seven seismic tetronic plates moving in different directions and there are seismic high volume rapture pressures built in them ready to erupt in any moment and will cause high magnitude earthquake in Dhaka a densly populated city and packed with building structures are not earthquake durable. An immediate Plan should be in placed to work on seismic precaution. As I previously wrote that Dhaka should be planned to evacuated or to reduce the population soon with a plan to work on to induce seismicity.
Induced seismicity refers to minor earthquakes and tremors that are caused by human activity that alters the stresses and strains on the Earth’s crust. Most induced seismicity is of a low magnitude that will have low effect than natural rapture erruption. Induced seismicity can also be caused by the injection of carbon dioxide as the storage step of carbon capture and storage, which aims to sequester carbon dioxide captured from fossil fuel production or other sources in earth’s crust as a means of climate change mitigation. Also fracking to pull out gases is another way of induce seismicity.
This effect has been observed in Oklahoma and Saskatchewan. Though safe practices and existing technologies can be utilized to reduce the risk of induced seismicity due to injection of carbon dioxide, the risk is still significant if the storage is large in scale. The consequences of the induced seismicity could disrupt pre-existing faults in the Earth’s crust as well as compromise the seal integrity of the storage locations.
The seismic hazard from induced seismicity can be assessed using similar techniques as for natural seismicity, although accounting for non-stationary seismicity. It appears that earthquake shaking from induced earthquakes is similar to that observed in natural tectonic earthquakes although, differences in the depth of the rupture will be noticeable. This means that ground-motion models derived from recordings of natural earthquakes, which are often more numerous in strong-motion databases than data from induced earthquakes, can be used. Subsequently, a risk assessment can be performed, taking account of the seismic hazard and the vulnerability of the exposed elements at risk (e.g. local population and the building stock). Finally, the risk can, theoretically at least, be mitigated, either through modifications to the hazard or a reduction to the exposure or the vulnerability.
There damages and deaths will be caused by human carelessness. Building structures must be rebuilt, restructured and maintained following proper recommended earthquake durable regulation to preven damages. Buildings are built on incompact lands without measured regulatory safety procedures, without solid foundation and old building aren’t maintained or checked for safety. Most importantly forecasted areas should be evacuated, work on safety measures.
The Earthquake prone zones around the world are marked and Dhaka is one of the high alert zone therefore, action plan must be put in place. According to the study, “if current injection practices continue, earthquake hazards are expected to decrease slowly.”
Oklahoma’s induced earthquakes increased drastically in 2009 and peaked in 2015, according to Stanford University. In order to reduce the quakes, Oklahoma regulators mandated a 40 percent water injection reduction in early 2016. The number of earthquakes soon declined. The researchers’ predicted decrease in quakes over the next couple of years following this recent trend.
Earthquake happens frequently due to the tectonics plates movements. Often small earthquakes passes through causing no harm at all and can be unnoticed by general people on the earthquake occurred land. Effects of some big earthquakes sometimes can be devastating. Big Earthquakes can destroy settlements, change landscapes, and cause many deaths. Earthquakes in the recent past has been very severe caused destruction and large number of deaths in USA, Canada and especially in Asia.
Earthquakes are the vibrations caused by build up pressure. The underground surface which the rock breaks and moves is called a fault plane. Algorithms methods used in seismology. Seismic Pressures released from the epicentre focus to the crust results in Earthquakes. Between the focus to the epicentre the pressures can spread out and it minimises waves’ pressure. Therefore, the above suggested induce seismic trend can be planned to induce seismic waves for lower magnitude to deter heavy damages.