1) A seismograph is an instrument used to measure earthquake shaking and consists of a sensor, recorder, and timer. The sensor contains a pendulum mass, string, and magnet.
2) Earthquake shaking is recorded by seismographs in three directions - north-south, east-west, and up-down. The variation of ground acceleration over time at a single point is called an accelerogram.
3) The magnitude and intensity of an earthquake provide different measures of its strength. Magnitude represents the total energy released while intensity depends on location and is based on the observed effects. Intensity scales include the Modified Mercalli scale.
This project is about the seismic wave signal Parameter enhancement with vibration analysis and
geomagnetic signal anomalies. In this project, we are going to detect the seismic signal using seismograph. The
ghosting effects were occurring and it will be suppressed using the filters. We propose to show the benefit of 1D
convolutional filter, to remove all the non-energetic wave-field in order to provide a better imaging of the
reflecting wave-field. In this paper, wave signals are decomposed into intrinsic (characteristic) modes via Discrete
Wavelet Transform [4] (DWT), Empirical Mode Decomposition [1] (EMD) and the relationship between seismic
activities are investigated.
Probabilistic Seismic Hazard Analysis Of Dehradun City , Uttrakhandijceronline
Dehradun is very old city and also rapidly growing urban area located in valley at foothills of Garhwal Himalayas. Dehradun city and adjoining region in western Himalayas is a is a very active seismic region of Himalayan belt , stretching from Pamir - Hindukush to Arkans in Burma.According to seismic zoning map of India , Dehradun city lies in Zone 4 and expected MSK intensity 8 .Dehradun city is located in the vicinity of twenty four independent seismic source zones which in reality are active faults. This creates uncertainties in size , location and the rate of recurrence of earthquakes. Probabilistic seismic hazard analysis provides a framework in which these uncertainties can be identified , quantified and combined in a rational manner to provide a more complete picture of the seismic hazard . This study presents a PSHA of the Dehradun city using the attenuation relationship given by Cornell et al (1979) in order to determinate various levels of earthquake-caused ground motion that will be exceeded in a given future time period.
A Possible Relationship between Gravitational Variations and Earthquakes in C...inventionjournals
An earthquake is not simply a sudden movement of the earth's crust, but the final product of a process that may have begun much earlier. In an area subject to tectonic stress, there can be precursory phenomena since this is where crustal deformation accumulates. A variation in gravity, measured instrumentally to the sixth decimal place, is one of the possible candidates to analyse measurable signals that precede, accompany and follow a seismic tremor. To verify the relationship between the number of earthquakes, the energy released, and the variations in gravity, the sequence in Central Italy was examined, above all that of January 2017. Data from a gravimeter located about 270 kilometres from the epicentral areas have been modelled as Standard Deviation, obtained from gravity measurements (400) carried out on the respective days. This indicator, of a statistical and mathematical nature, indicates the degree of dispersion with respect to its mean value, taken as the average value of these gravity measurements, and shows a positive correlation with the number of daily earthquakes and the energy released by the seismic sequence of January 2017.
REVIEW OF RECENT EARTHQUAKES IN THE LIGHT OF PLATE TECTONICS AND SEISMIC RISK...Johana Sharmin
This slide represents the knowledge of tectonic plates related problems and massive earthquakes affecting our lives. Here also I accumulated the relationship between geomorphological and plate tectonic aspects in Bangladesh.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
This project is about the seismic wave signal Parameter enhancement with vibration analysis and
geomagnetic signal anomalies. In this project, we are going to detect the seismic signal using seismograph. The
ghosting effects were occurring and it will be suppressed using the filters. We propose to show the benefit of 1D
convolutional filter, to remove all the non-energetic wave-field in order to provide a better imaging of the
reflecting wave-field. In this paper, wave signals are decomposed into intrinsic (characteristic) modes via Discrete
Wavelet Transform [4] (DWT), Empirical Mode Decomposition [1] (EMD) and the relationship between seismic
activities are investigated.
Probabilistic Seismic Hazard Analysis Of Dehradun City , Uttrakhandijceronline
Dehradun is very old city and also rapidly growing urban area located in valley at foothills of Garhwal Himalayas. Dehradun city and adjoining region in western Himalayas is a is a very active seismic region of Himalayan belt , stretching from Pamir - Hindukush to Arkans in Burma.According to seismic zoning map of India , Dehradun city lies in Zone 4 and expected MSK intensity 8 .Dehradun city is located in the vicinity of twenty four independent seismic source zones which in reality are active faults. This creates uncertainties in size , location and the rate of recurrence of earthquakes. Probabilistic seismic hazard analysis provides a framework in which these uncertainties can be identified , quantified and combined in a rational manner to provide a more complete picture of the seismic hazard . This study presents a PSHA of the Dehradun city using the attenuation relationship given by Cornell et al (1979) in order to determinate various levels of earthquake-caused ground motion that will be exceeded in a given future time period.
A Possible Relationship between Gravitational Variations and Earthquakes in C...inventionjournals
An earthquake is not simply a sudden movement of the earth's crust, but the final product of a process that may have begun much earlier. In an area subject to tectonic stress, there can be precursory phenomena since this is where crustal deformation accumulates. A variation in gravity, measured instrumentally to the sixth decimal place, is one of the possible candidates to analyse measurable signals that precede, accompany and follow a seismic tremor. To verify the relationship between the number of earthquakes, the energy released, and the variations in gravity, the sequence in Central Italy was examined, above all that of January 2017. Data from a gravimeter located about 270 kilometres from the epicentral areas have been modelled as Standard Deviation, obtained from gravity measurements (400) carried out on the respective days. This indicator, of a statistical and mathematical nature, indicates the degree of dispersion with respect to its mean value, taken as the average value of these gravity measurements, and shows a positive correlation with the number of daily earthquakes and the energy released by the seismic sequence of January 2017.
REVIEW OF RECENT EARTHQUAKES IN THE LIGHT OF PLATE TECTONICS AND SEISMIC RISK...Johana Sharmin
This slide represents the knowledge of tectonic plates related problems and massive earthquakes affecting our lives. Here also I accumulated the relationship between geomorphological and plate tectonic aspects in Bangladesh.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
3. Seismograph
Instrument that measures earthquake shaking
Three components:
1. Sensor – (Pendulum mass, string, magnet & Support
together constitute)
2. Recorder – (drum, pen & chart paper constitute)
3. Timer – (motor that rotates the drum at constant speed
that forms the timer)
4. 4/6/2023 RS CDC NITTTR 4
Two horizontal seismographs - one of which swings from north
to south, while the other one swings from east to west and the
third dimension is caught by a vertical seismograph, also called
up-down or z-seismograph.
Seismographs
5. 4/6/2023 RS CDC NITTTR 5
North-South, East-West and Up-Down-Seismogram
6. Shaking is more severe (about twice as much) at the
Earth's surface than at substantial depths. This is often the
basis for designing structures buried underground for
smaller levels of acceleration than those above the ground
The motion at any site on ground is random in nature with
its amplitude and direction varying randomly with time.
The motion of the ground can be described in terms of
displacement, velocity or acceleration
4/6/2023 RS CDC NITTTR 6
7. 4/6/2023 RS CDC NITTTR 7
Velocity is the integral of the acceleration
Integrate the velocity and compute the displacement
8. Accelerogram
4/6/2023 RS CDC NITTTR 8
The variation of ground acceleration with time recorded at a
point on ground during an earthquake is called an
accelerogram.
The nature of accelerograms may vary depending on
energy released at source, type of slip at fault rupture,
geology along the travel path from fault rupture to the
Earth’s surface, and local soil.
9. Accelerogram
They carry distinct information regarding ground shaking -
peak amplitude, duration of strong shaking, frequency
content (e.g., amplitude of shaking associated with each
frequency) and energy content (i.e., energy carried by
ground shaking at each frequency).
4/6/2023 RS CDC NITTTR 9
11. For an example, a horizontal PGA (peak ground acceleration)
value of 0.6g (0.6 times the acceleration due to gravity)
suggests that the movement of the ground can cause a
maximum horizontal force on a rigid structure equal to 60% of
its weight.
(In a rigid structure, all points in it move with the ground by the
same amount, and hence experience the same maximum
acceleration of PGA).
4/6/2023 RS CDC NITTTR 11
12. Size of Earthquake
The size of the earthquake is normally represented by
Magnitude (amount of energy released)
The magnitude of the earthquake is a single value for a given
earthquake
Intensity (a qualitative measure based on degree of
destruction caused)
It is an indicator of the severity of shaking generated at a
given location which is much higher near the epicenter than
farther away.
4/6/2023 RS CDC NITTTR 12
13. 4/6/2023 RS CDC NITTTR 13
Focal Depth, is an important parameter in determining
the damaging potential of an earthquake.
14. Magnitude Vs Intensity
4/6/2023 RS CDC NITTTR 14
During the same earthquake of a certain magnitude, different
locations experience different levels of intensity.
15. Magnitude scale
At the same distance, seismograms of larger earthquakes have
bigger wave amplitude than those of smaller earthquakes
For a given earthquake, seismograms at farther distances have
smaller wave amplitude than those at close distances.
4/6/2023 RS CDC NITTTR 15
The Richter Scale (a magnitude scale) is obtained from
the seismograms and accounts for the dependence of
waveform amplitude on epicentral distance.
Richter scale is also called as Local Magnitude scale.
16. Magnitude scale
C.F. Richter defined the earthquake magnitude as the
logarithm to the base 10 of the largest displacement
(amplitude) of a standard seismograph** situated at an
epicentral distance of 100 km from the focus
(**Wood-Anderson Seismograph with properties T=0.8 sec;
m=2800; and damping nearly critical ≈ 0.8).
where A denotes the amplitude in micron (10-6m); and M is
the magnitude of the earthquake.
4/6/2023 RS CDC NITTTR 16
17. Magnitude scale
When the distance from the epicenter at which an
observation is obtained other than 100 km, a correction is
introduced to the equation as given below
where M is the magnitude of the earthquake; Δ=distance
from epicenter (km), MΔ= magnitude of the earthquake
calculated for earthquake using the values measured at a
distance Δ from the epicenter.
The graphical form of this procedure is given below.
4/6/2023 RS CDC NITTTR 17
18. Epicenter distance and the Earthquake's Magnitude
4/6/2023 RS CDC NITTTR 18
Measure the distance between the
first P wave and the first S wave.
Find the point for 24 seconds on the
left side of the chart below and mark
that point.
According to the chart, this
earthquake's epicenter was 215 km.
Measure the amplitude of the
strongest wave. On this seismogram,
the amplitude is 23 millimeters.
Find 23 millimeters on the right side
of the chart and mark that point.
Place a ruler on the chart between
the points (distance to the epicenter
and the amplitude).
The point where the ruler crosses the
middle line on the chart marks the
magnitude (strength) of the
earthquake.
This earthquake had a magnitude of
5.0.
19. Magnitude scale
An increase in magnitude (M) by 1.0 implies 10
times higher waveform amplitude and about 31 times
higher energy released.
For an example, energy released in a M 7.7 earthquake is
about 31 times that released in
a M 6.7 earthquake, and is about 1000 (≈31×31) times
that released in a M 5.7 earthquake
4/6/2023 RS CDC NITTTR 19
20. Magnitude scale
Other magnitude scales are
Body Wave Magnitude
Surface Wave Magnitude and
Wave Energy Magnitude.
4/6/2023 RS CDC NITTTR 20
21. Intensity
The intensity of earthquake depends on
Distance from the epicenter
Compactness of the underlying ground
Type of construction
Density of population
Duration of the earthquake and
Depth of the focus.
4/6/2023 RS CDC NITTTR 21
22. Intensity
The most popular intensity scale is the Modified Mercalli
Intensity (MMI) Scale.
This scale, composed of 12 increasing levels of intensity
that range from imperceptible shaking (i.e. vibration
below the limits of sensibility) to catastrophic destruction.
The higher numbers of the scale are based on observed
structural damage.
4/6/2023 RS CDC NITTTR 22
23. Intensity
The other intensity scales are
Mendvedev-Spoonheuer-Karnik scale (MSK 64). (This
scale is more comprehensive and describes the intensity
of earthquake more precisely. Indian seismic zones were
categorized on the basis of MSK 64 scale)
(Refer Annex-D; IS 1893 (part-1) – 2016)
Rossi-Forel (RF) scale
Japanese Meteorological Agency (JMA) intensity scale
4/6/2023 RS CDC NITTTR 23
24. Zone Factors Vs Intensities
Zone II MSK Scale VI or less
Zone III MSK Scale VII
Zone IV MSK Scale VIII
Zone V MSK Scale IX and above
25. 4/6/2023 RS CDC NITTTR 25
A comparison of the various seismic intensity scales used worldwide
27. Magnitude and Intensity in Seismic Design
Can my building withstand a magnitude 7.0 earthquake???
M 7.0 earthquake causes different shaking intensities at
different locations, and the damage induced in buildings at
these locations is different.
Thus, the buildings and structures are to be designed to
resist the particular levels of intensity of shaking and not so
much the magnitude.
4/6/2023 RS CDC NITTTR 27
28. How is an Earthquake’s Epicenter Located?
Seismic wave behavior
P waves arrive first, then S waves, then L and R
Average speeds for all these waves is known
After an earthquake, the difference in arrival
times at a seismograph station can be used to
calculate the distance from the seismograph to
the epicenter.
30. The farther away a seismograph is from the focus of an
earthquake, the longer the interval between the arrivals of the
P- and S- waves
31. How is an Earthquake’s Epicenter Located?
Three seismograph
stations are needed to
locate the epicenter of
an earthquake
A circle where the
radius equals the
distance to the
epicenter is drawn
The intersection of the
circles locates the
epicenter