Effects of Temperature Increase on Earthquake Frequency and Depth in Northern Pakistan
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1 21 International Conference on Biology, Environment and Chemistry IPCBEE vol.1 (211) (211) IACSIT Press, Singapore Effects of Temperature Increase on Earthquake and Depth in Northern Pakistan Muhammad Usman Department of Earth and Environmental Sciences Bahria University Muhammad Zafar Department of Earth and Environmental Sciences Bahria University Mamoru Murata Department of Geosciences Naruto University of Education Tokushima, Japan naruto-u.ac.jp Najeeb Ahmad Amir Seismic Section Pakistan Meteorological Department (PMD) Abstract in this paper an attempt is made to establish a possible correlation between the temperature increase and earthquake frequency in the Northern areas of Pakistan by focusing mainly on depth. The temperature data consists of decadal (1961-2) and five year (21-2) averages for Gilgit, Sakardu, Chitral and Islamabad based observatories. The seismic data is of duration between 1961 and 24.The study has shown that there exists a positive correlation between the temperature increase and earthquake frequency. The temperature has increased.2c during the study period. This rise in temperature is causing the glaciers of study area to melt, thus releasing pressure on the Earth below. The Earth, in turn, is possibly rebounding causing earthquakes to occur. In general, the average frequency of shallow (-8km) and intermediate (81-3 km) earthquakes shows positive correlation with temperature. This study further indicates that the total depth affected by this process is probably no more than 16km. Keywords-global warming; glacier melting; isostatic rebound; increase in seismic activity with temperature. I. INTRODUCTION The Global warming is becoming very much hazardous to life. This is not only changing our world s climate and economy but, it is also causing direct and indirect changes on and within the surface of the Earth. This effect is very much threatening for Northern zone of Pakistan which has glaciers spreading over a vast area (Fig. 1). Tectonically, this area is marked with numerous active faults (Fig. 2) [1]. Due to these faults, this zone is seismologically very active and experience frequent earthquakes than any where else in Pakistan. It is also affected by Global Warming, causing receding of glaciers. These glaciers weigh billions of tons which on melting can cause the crust of Northern areas to relax and rebound. As wasting ice sheets and caps unload the solid Earth, stresses released can both deform the Earth surface [2] and decompress the Earth s mantle [3]. All over the world, the last twenty years data shows a noticeable increase in the number of earthquakes per year. This is because of tremendous increase in number of seismograph stations and the improved global communications [4]. In Northern areas of Pakistan, the analytical tools such as source, stations and seismographs have remained the same from 1961 to 2 and the data collected in this period shows increase in earthquake frequency. According to this study one of the main factors for increase in earthquake frequency can be the temperature. Increase of temperature is causing glaciers to melt thus releasing pressure on Earth below which in turn possibly rebounds, causing earthquakes []. An increase in average annual mean surface temperature by.6 C ±.2 C between 186 and 2 and a decrease of 1% of snow cover in northern hemisphere since late 196s has been reported [6]. It has been also predicted that the Himalayan glaciers will disappear within 4 years causing drastic changes in river flow and sever water shortages [7,8]. A few larger glaciers are expanding in the Karakoram and adjacent areas [9,1], however, reports also indicate that may glaciers are still losing mass [11,12]. Since 184 most of the Himalayan glaciers have retreated more than 12 m [13]. 164
2 Figure 1. Map showing study area (bounded by blue line) with snow cover. The place marks show the observatory locations.(modified Google image) Figure 2. Seismotectonic map showing the locations of Yasin (YSN) and Hamran (HSZ) Seismic zones and Faults in the study aea. [1] UHF=Upper Hunza Fault, RF=Reshun Fault, MKT=Main Karakoram Thrust, MMT=Main Mantle Thrust, NF=Noushera Fault, KF=Kund Fault, AF=Attock Fault, IF=Indus Fautlt, MBT=Main Boundary Thrust. The annual melt water of 13 million m 3 for Hinarche Glacier in Bagrot Valley shows the magnitude of glacier runoff in such environments [14]. These differences are considered to be the result of changing trends of higher temperatures in winters and lower temperatures in summers since 196s [1, 16]. The earth s climate model projections suggest that global surface air temperature will considerably increase in future due to radiative effects of atmospheric gases [1]. II. MATERIAL AND METHODS The temperature data contains decadal average of period from 1961 to 2 and five year averages recorded from 21 to 2. The temperature data of Chitral observatory starts from The duration of seismic data, used in this study, is 1961 to 24. The temperature and seismic data are provided by Pakistan Meteorological Department (PMD). A. Selection of Study Area and Study The Northern Areas of Pakistan have been selected for this study because of abundant varied sized glaciers and active faults. The effects of temperature increase have been studied form 1961 to 24. During the study period there has been no advancement in seismographs and no new seismic stations have been developed by PMD. B. Temperature Study A network of four observatories was used (Fig. 1). The study of temperature was done by calculating the decadal and five yearly variations of average temperature during the period 1961 to 2. C. Seismological Study The seismic data of the study area for the selected time duration was used to calculate the average earthquake frequencies. The depth, based on earthquake foci, was divided into three zones to know its effect on the earthquake frequency. The depth zones include shallow (-8km), intermediate (81-3km) and deep (>3km) zones. The intermediate zone was further divided into three zones ranging in depth from 81-16km; km and 241-3km to study various trends in earthquake frequencies. TABLE I. AVERAGE MONTHLY TEMPERATURE VALUES AND INCREASE FOR THE PERIOD Months Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ave. Temp. in C Depth TABLE II. NUMBER AND FREQUENCY OF EARTHQUAKES FOR VARIOUS DEPTH ZONES DURING THE PERIOD Shallow (-8km) Intermediate (81-3km) Deep (Above 3km) Total Cumulative Freq
3 Total TABLE III. NUMBER AND FREQUENCY OF EARTHQUAKES FOR VARIOUS INTERMEDIATE DEPTH ZONES DURING THE PERIOD Depth Intermediate (81-3km) km km km Total Cumulative Freq Total Average Temperature Curve Average Earthquake Curve Figure 3. Average temperature curve for the period Figure 4. Cumulative average frequency of earthquakes during the period Depth (Shallow) Depth (Intermediate) Figure. Average earthquake frequency for shallow depth during Figure 6. Average earthquake frequency for intermediate the period depth during the period
4 Intermediate (81-16km) Intermediate (161-24km) Figure 7. Average earthquake frequency for intermediate zone (81-16km). III. RESULTS AND DISCUSSION In Northern areas of Pakistan, the source, stations and seismographs have remained the same during the period 1961 to 2. The average monthly temperature values for the above mentioned study period are given in Table 1. Total number of the earthquakes and their average and cumulative frequencies for various depth zones are given in Table 2 and 3, respectively. Figure 3 shows an overall increase of.2 C with.2 C for the period and.32 C from 21 to 2. This increase compared to the global average annual mean surface temperature rise by.6 C ±.2 C from 186 to 2 [6] is much more alarming and causing the glaciers of the Northern area to melt at faster rates than elsewhere. Due to this unexpectedly high melting of the glaciers stress on Earth below are released. If erosion or melting ice reduces load, the crust would slowly rise upward by isostatic rebound [18] and stresses released would deform the Earth surface [2] causing earthquakes. This effect can be more prominent in Northern areas of Pakistan as this region contains many active faults which make it sensitive to localized changes like removal of load due to loss in mass of glaciers. In this zone there has been no change in seismic stations and instruments since 1961 to 24, so the increase in seismic activity during above mentioned period can be correlated with natural causes like temperature increase rather than tremendous increase in number of seismograph stations and the improved global communications [4]. A total of 1162 earthquakes have been reported from the study area (Table2) during the study period. Cumulative average earthquake frequencies plotted (Fig. 4) depict a gradual increase in the earthquakes for the study period. Fig. and 6 show increase in the average earthquake frequencies for the shallow and intermediate depth zones, respectively, however, a sharp increase in earthquake frequency for the shallow depth zone from is quite obvious which may be contributed to the sudden increase in temperature for the same period (Fig. 3) due to global warming. Figure 8. Average earthquake frequency for intermediate zone (161-24km) Average earthquake frequencies for the two intermediate depth sub zones (81-16km and km) are given in Fig. 7 and 8, respectively. The km zone shows a gradual increase in earthquake frequency whereas km zone shows increase from 1971 to 2 and then a sharp decrease from 21 to 24 periods, suggesting that the average earthquake frequencies of the former zone positively correlate to the corresponding average temperatures. This means that the total depth affected by the loss in mass of glaciers is probably 16km. IV. CONCLUSIONS This preliminary study conducted for the Northern areas of Pakistan shows a positive correlation between the temperature increase, due to global warming, and the earthquake frequencies. All the data collecting and reporting perimeters like the source, the stations and the seismographs remained the same during the period of study. This leads to infer that the main factor for the increase in earthquake frequency is the temperature increase which is causing the glaciers to melt and thereby releasing pressure on the Earth. The Earth, in turn, is possibly rebounding causing earthquakes. The range of depth affected by this glacier melt is probably not more than 16 km. REFERENCES [1] Kazmi, A.H. and Jan, M.Q Geology and Tectonics of Pakistan. In: Neotectonics. pp. 48, 416. Graphic Publishers. Karachi. [2] Pagli, C. and Sigmundsson, F. 28. Will present day glacier retreat increase volcanic activity? Stress induced by recent glacier retreat and its effect on magmatism at the Vatnajökull ice cap, Iceland.Geophysical Research Letters 3: L934. [3] Sigvaldason, G.E., Annertz, K. and Nilsson, M Effect of glacier loading/deloading on volcanism: postglacial volcanic production rate of the Dyngjufjöll area, central Iceland. Bulletin of Volcanology 4: [4] (February, 21) [online] Available: 167
5 [] Usman, M., Qureshi, S.N. and Amir, N.A. Effects of Global Warming on the of in Northern Areas of Pakistan. 21. Science Vision, Volume 1. Islamabad. Comsats. [6] PCC. 21. Climate Change 21: Synthesis report. A contribution of working groups I, II and III to the third assessment report of the Intergovernmental Panel on Climate Change. Watson RT (ed). Cambridge University Press, Cambridge. [7] WWF. 2. An overview of glaciers, glacier retreat, and subsequent impacts in Nepal, India and China. World Wild Life Fund, Nepal Program. [8] Pearce, F Flooded out: retreating glaciers spell disaster for valley communities. New Scientist 162 (2189): 18. [9] [Hewitt, K. 2. The Karakoram Anomaly? Glacier expansion and the elevation effect, Karakoram Himalaya. Mountain Research and Development 2 (4): BioOne [1] [1] Smiraglia, C., C. Mayer, C. Mihalcea, G. Diolaiuti, M. Belò, and G. Vassena. 27. Ongoing variations of Himalayan and Karakoram glaciers as witnesses of global changes: Recent studies of selected glaciers. Developments in Earth Surface Processes 1: [11] Ding, Y., S. Liu, J. Li, and D. Shangguan. 26. The retreat of glaciers in response to recent climate warming in western China. Annals of Glaciology 43:97 1. [12] [12] Haritashya, U. K., M. P. Bishop, J. F. Shroder, A. B. G. Bush, and H. N. N. Bulley. 29. Space-based assessment of glacier fluctuations in the Wakhan Pamir, Afghanistan. Climatic Change 94: 18. [13] Ahmed, N. and Rais, Sarwar Himalayan Glaciers. In: Climate effects and Himalaya Gaciers. pp New Dehli. A. P. H Pub Co. [14] Mayer, Christoph., Lambrecht. A.,Mihalcia, C., Belo, M.,Diolaiuti, G., Smiraglia, C and Bashir, F.21. Analysis of Glacier Melt Water in Bagrot Valley Karakoram. Mountain Research and Development 3(2). PP International Mountain society. [1] Archer, D. R. and H. J. Fowler. 24. Spatial and temporal variations in precipitation in the upper Indus basin, global teleconnections and hydrological implications. Hydrology and Earth System Sciences 8: [16] Fowler, H. J. and D. R. Archer. 26. Conflicting signals of climatic change in the Upper Indus Basin. Journal of Climate 19: [17] Delworth, T., Mahlman, J. D. and Knutson, T.R. 1999: Changes in summer temperature and heat related mortality since 1971 in North Carolina, South Finland, and Southeast England.Environ Res 91:1-7. [18] Wicander, R. and Monroe, S., 26. Historical Geology. In: Cenozoic Geological History: The Pleistocene and Holocene Epochs. pp. 39. Belmont, CA: Thomson Brooks/Cole. 168
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