Telegram Web Link
πŸ”† Global Distribution of Earthquakes

πŸ“ Major Seismic Belts
βœ… The circum-Pacific seismic belt found along the rim of the Pacific Ocean is the world’s greatest earthquake belt. Around 81% of the world’s largest earthquakes occur here. Known as the β€œRing of Fire”.

βœ… The Alpide earthquake belt spreads from Java to Sumatra, through the Himalayas, the Mediterranean, and into the Atlantic. It causes about 17% of the world’s earthquakes.

βœ… The third belt is the mid-Atlantic Ridge, a submerged divergent plate boundary where tectonic plates are spreading apart.

πŸ”† Seismic Mapping of India

πŸ“ Seismic Zonation Insights
βœ… About 59% of India’s land area is prone to earthquakes.

βœ… The seismic map classifies India into 4 seismic zones based on intensity.

βœ… Zone V is the most active (Very High Risk), while Zone II is the least active.

➀ Approx. 10.79% in Zone V, 17.49% in Zone IV, 30.79% in Zone III, and 40.93% in Zone II.

#Geography
#disaster_management
πŸ”† Cold Lava (Lahar): A Silent but Deadly Force

πŸ“ Context: The Mount Kanlaon volcano in the Philippines recently witnessed rivers of cold lava, also known as lahars.

πŸ“Œ What is Cold Lava (Lahar)?
βœ… A fast-moving slurry of water, volcanic ash, rock fragments, and pumice.
βœ… Forms when volcanic ash mixes with heavy rain or when glacial ice melts, even without eruptions.
βœ… Moves at high speeds, reaching hundreds of km/h, making it more dangerous than slow-moving lava.
βœ… Hot & destructive**β€”traps heat, **burns everything in its path, causes property damage & loss of life.
βœ… Creates floods by damming rivers, harming ecosystems, and increasing flood risks.

⚠️ How to Mitigate Lahars?
βœ… Early warning systems & engineering solutions can reduce damage.
βœ… Community education on lahar-prone zones saves lives.

πŸŒ‹ Lava vs. Magma:
🟠 Magma – Found inside the Earth (molten rock in the mantle).
πŸ”΄ Lava – Magma that has reached the surface through a volcanic vent.


#ColdLava #Lahar #VolcanoHazards #DisasterPreparedness #Geography
πŸ”† Cold Lava (Lahar): A Silent but Deadly Force

πŸ“ Context: The Mount Kanlaon volcano in the Philippines recently witnessed rivers of cold lava, also known as lahars.

πŸ“Œ What is Cold Lava (Lahar)?
βœ… A fast-moving slurry of water, volcanic ash, rock fragments, and pumice.
βœ… Forms when volcanic ash mixes with heavy rain or when glacial ice melts, even without eruptions.
βœ… Moves at high speeds, reaching hundreds of km/h, making it more dangerous than slow-moving lava.
βœ… Hot & destructive**β€”traps heat, **burns everything in its path, causes property damage & loss of life.
βœ… Creates floods by damming rivers, harming ecosystems, and increasing flood risks.

⚠️ How to Mitigate Lahars?
βœ… Early warning systems & engineering solutions can reduce damage.
βœ… Community education on lahar-prone zones saves lives.

πŸŒ‹ Lava vs. Magma:
🟠 Magma – Found inside the Earth (molten rock in the mantle).
πŸ”΄ Lava – Magma that has reached the surface through a volcanic vent.


#ColdLava #Lahar #VolcanoHazards #DisasterPreparedness #Geography
πŸ”† Winter Weather in India: Key Drivers & Effects

πŸ“ 1. Surface Pressure & Winds
βœ… High-pressure zone forms in Central & West Asia.
βœ… Cold continental winds blow into India from the north.
βœ… These collide with trade winds β†’ unstable zone forms.
βœ… Result: Northwest India experiences dry, cold North-Westerlies.

πŸ“ 2. Jet Stream & Upper Air Circulation
βœ… Westerly jet streams dominate Asia in winter.
βœ… Tibetan Himalayas split jet into two:
β€ƒπŸ”Ή North branch flows over Tibetan Plateau.
β€ƒπŸ”Ή South branch crosses south of the Himalayas.
βœ… Subtropical westerly jet brings winter rain to northwest India.

πŸ“ 3. Western Disturbances & Cyclones
βœ… Western disturbances (from the Mediterranean) hit north & northwest India.
βœ… Bring light winter rain β†’ great for wheat crops.
βœ… Tropical cyclones still possible in Oct–Nov, driven by easterlies.
βœ… Hit east coast states – TN, AP, Odisha with heavy rain + wind.

#Geography
πŸ”† Effects of Ocean Currents

πŸ“ Climate Control
βœ… Warm currents raise temperatures; cold ones cool them.
➑️ Example: North Atlantic Drift warms England; Canary cools Spain.

πŸ“ Rainfall & Deserts
βœ… Warm currents β†’ more rainfall.
βœ… Cold currents β†’ desert formation.
➑️ Example: Cold Humboldt Current causes the Atacama Desert.

πŸ“ Fishing Zones
βœ… Convergence of warm & cold currents supports plankton β†’ rich fish stocks.
➑️ Example: Grand Banks of Newfoundland.

πŸ“ Navigation
βœ… Currents aid efficient maritime travel by influencing shipping lanes.

πŸ“ Temperature Moderation
βœ… Currents redistribute heat and stabilize coastal climates.
➑️ Example: England remains mild due to warm currents.

#Geography
πŸ”† Why El NiΓ±o Is Hard to Predict

πŸ“ El NiΓ±o remains a major challenge in climate forecasting due to dynamic ocean-atmosphere interactions
βœ… 🌊 ENSO has 3 phases: El NiΓ±o (warm), La NiΓ±a (cool), and neutral.
βœ… πŸŒ€ Climate models struggle due to late-emerging ENSO signals (only in early summer).
βœ… 🌬️ Westerly wind bursts and Indian Ocean anomalies can trigger or dampen ENSO.
βœ… πŸ§ͺ New model: Recharge Oscillator (RO) simulates ENSO as a contest between sea-surface temp & sub-surface heat.
βœ… 🌐 Disagreements remain on which ocean basin is most influential in modelling.

πŸ“ Prelims Question:
Which of the following best describes the ENSO phenomenon?
A. Only a Pacific Ocean event
B. Ocean-atmosphere interaction with 3 phases
C. Caused by monsoonal winds
D. Predictable using historical data
Answer: B


πŸ“ Mains Question (GS1 – Geography):
What makes the prediction of the El NiΓ±o Southern Oscillation (ENSO) phenomenon difficult? Discuss the implications for global weather forecasting and agriculture.


#GS1 #Geography #Climate #ENSO #ElNino #Prelims2026 #UPSC #prelims

Join @Mapping_prelims_mains
Science and technology is one of the Subjects which have high weightage, upsc prelims & mains GS 3

CLICK HERE TO JOIN

Hindu, IE, PIB NEWS πŸ‘†
πŸ”†Mount Lewotobi Laki-laki:
βœ…Location: It is located in Indonesia’s East Nusa Tenggara province on Flores Island.
βœ…It is situated along the famous β€˜Ring of Fire’ in the Pacific region.
βœ…It is one of the most frequently active volcanoes in the region. 
βœ…It has two peaks arranged on a NW-SE line separated by 2 km and a 1232 m high saddle. This gave the twin volcano its name, Lewotobi, β€œhusband and wife”.
βœ…The two peaks correspond to the Lewotobi Lakilaki (man) and Lewotobi Perempuan (woman)
Lewotobi Lakilaki (1584 m) has a summit crater of 400 m diameter open to the north. Lewotobi Perampuan (1703 m)’s crater is 700 m wide.
βœ…Lewotobi Lakilaki has been frequently active during the 19th and 20th centuries, while the taller and broader Lewotobi Perempuan has erupted only twice in historical time.
βœ…Small lava domes have grown during the 20th century in the summit craters of both volcanoes.

#Places_in_news

Join @Mapping_prelims_mains
πŸ”† Koeppen’s Climatic Classification of India

πŸ“ Key Concepts
βœ… Developed by Wladimir Koeppen β€” based on annual mean temperature and precipitation
βœ… Links vegetation distribution with climate types
βœ… Uses letter codes to classify major climate zones based on seasonality

πŸ“ Major Climatic Types in India
βœ… (Am) Monsoon with short dry season – West coast (e.g., Goa)
βœ… (As) Monsoon with dry summer – Coromandel coast
βœ… (Aw) Tropical Savanna – Most of Peninsular India
βœ… (BShw) Semi-arid Steppe – Interior Deccan, Gujarat, Rajasthan, Punjab, J&K
βœ… (BWhw) Hot Desert – West Rajasthan only
βœ… (Cwg) Monsoon with dry winters – Northern Plains
βœ… (Dfc) Cold-humid winter with short summer – Northeast India
βœ… (E) Polar Climate – Upper Himalayas
βœ… (ET) Tundra Climate – Higher Himalayan ranges, Ladakh

πŸ“ Utility of the Classification
βœ… Helps in agro-climatic zoning, crop selection, water planning
βœ… Useful for disaster risk reduction, ecological studies, and climate adaptation policies


πŸ“˜ Prelims Question
Q. Which of the following climate types in India is represented by Koeppen’s classification code β€˜Aw’?
A. Cold-humid winter with short summer
B. Monsoon with short dry season
C. Tropical Savanna
D. Tundra Climate

Answer: βœ… C. Tropical Savanna


πŸ“ Mains Question (GS1 – Geography)
Q. Discuss the significance of Koeppen’s climatic classification in understanding India’s climatic diversity. How can it assist in agricultural and water resource planning?

#Geography
Subject wise channel Statics+ current affairs with pyq

Polity CLICK HERE MCQ CLICK HERE

History CLICK HERE MCQ CLICK HERE

Society CLICK HERE

Security CLICK HERE

Economy CLICK HERE MCQ click here

IR CLICK HERE MCQ CLICK HERE

Mains pyq CLICK HERE

Prelims PYQ GS CLICK HERE

CSAT PYQ CLICK HERE
πŸ”† Global Ocean Heat Content (OHC) – Climate Indicator

πŸ“ Definition: Total heat absorbed & stored in oceans, measured at various depths.

βœ… Key Facts
β€’ Oceans absorb 90% of excess global heat.
β€’ Atlantic, Pacific, and Southern Oceans warm faster than global average.
β€’ Since 1980s, OHC has doubled/tripled (2023 study).

βœ… Significance
β€’ Drives sea level rise, alters weather, disrupts ecosystems, and strengthens cyclones.
β€’ A stable climate change indicator beyond surface temperatures.

#Geography
Subject wise channel Statics+ Hindu IE PIB

Science technology CLICK HERE MCQ CLICK HERE

Environment CLICK HERE MCQ CLICK HERE

Mapping CLICK HERE MCQ CLICK HERE

Govt schemes CLICK HERE MCQ CLICK HERE

Art culture CLICK HERE MCQ CLICK HERE

Essay toppers CLICK HERE

Ethics topper's click here

Optional topper's click here

Topper's notes+ ans copy click here

Pyq PDF click here
πŸ”† External Migration: A Double-Edged Sword

πŸ“Migration brings economic benefits but also social challenges.

βœ… Positive Impacts
β€’ Remittances boost economy: India received over $100 billion recently.
β€’ Employment generation abroad: Eases pressure on local job markets.
β€’ Skill transfer: Returnees bring global expertise (e.g., IT professionals).
β€’ Improved living standards: Better access to health and education.
β€’ Cultural exposure: Enhances language, awareness, global ties.
β€’ Diplomatic leverage: Diaspora strengthens India’s global influence.

❌ Negative Impacts
β€’ Brain drain: Skilled youth, especially STEM grads, migrate.
β€’ Family disruption: Long separation causes emotional stress.
β€’ Regional imbalance: Punjab, Kerala over-dependent on remittances.
β€’ Worker exploitation: Many face wage theft, legal issues abroad.
β€’ Remittance dependency: Economic shocks like COVID-19 hit hard.
β€’ Cultural erosion: Identity conflicts among migrant youth.

#geography #society

Join https://www.tg-me.com/Mapping_prelims_mains
Q.: The average height of the Kosi plain from mean sea level is
Anonymous Quiz
34%
300 m
48%
150 m
15%
30 m
2%
None of the above
πŸ”† India Adds 3,582 km to Coastline & 7 New Islands

πŸ“A new reassessment using improved tech has increased India’s official coastline length by ~50%
βœ… Previous coastline (1970s): 7,516 km
βœ… New official length: 11,058.6 km
βœ… Reason: Higher-resolution data (1:25000 map scale vs older 1:45000)
βœ… 3,582 km β€œadded” due to better capture of curves, bends & offshore island coastlines
βœ… 7 new offshore islands identified; total island count now 1,389 (1,298 offshore + 91 inshore)
βœ… Coastline measurement now to be done every 10 years

πŸ“State-wise highest coastline
βœ… Gujarat (2,340 km), Andaman & Nicobar (3,083 km), Tamil Nadu (1,068 km)

πŸ“Implications
βœ… Better disaster management, CRZ rules, coastal zone protection
βœ… Improved planning for shipping, security, and tourism
βœ… Reclassification will not affect boundaries, only accuracy


πŸ“ Prelims Question:
Which state has the longest coastline in India as per the revised measurements?
(a) Maharashtra
(b) Tamil Nadu
(c) Gujarat βœ…
(d) Andhra Pradesh

πŸ“ Mains Question:
Explain the significance of scientific reassessment of coastline and islands in India’s disaster management and developmental planning.

#GS1 #Geography #Coastline #Mapping
IAS officer initiative IE series

CLICK HERE
Members who have just joined this channel are requested to join our main channel too.

It is one of the old channel on telegram with 85 thousand aspirants.

CLICK HERE TO JOIN
πŸ”† Why Large Cities Attract More Migrants than Smaller Towns
πŸ“˜ A Developing Country Perspective – UPSC 2024


πŸ“ Migration is skewed towards big cities due to:

βœ… Diverse & abundant employment in formal/informal sectors
β€’ Example: Mumbai & Bengaluru attract rural youth in tech, finance, construction

βœ… Better access to education & healthcare
β€’ Example: Delhi’s DU and AIIMS draw families for advancement

βœ… Superior infrastructure & logistics
β€’ Example: Metro, airports, 24Γ—7 power in Chennai enhance urban appeal

βœ… Urban informal economy absorbs unskilled labor
β€’ Example: Bihar & UP migrants work in Mumbai’s construction/domestic sectors

βœ… Presence of migrant networks & support systems
β€’ Example: Malayali migrants in Kochi facilitate Gulf migration links

βœ… Urban aspirations & perceived mobility
β€’ Example: Media portrayals of progress create a strong β€œpull effect”

πŸ“ Mains GS1 Question
Explain the economic and socio-cultural factors that make large Indian cities preferred migration destinations compared to smaller towns.
ο»Ώ
#GS1 #geography

Join https://www.tg-me.com/Mapping_prelims_mains
πŸ”† Coastal Landforms – UPSC Notes

πŸ“ Classification & Significance | Erosion, Deposition, and Government Response

βœ… Erosional Landforms
➀ Headlands and Bays: Waves erode softer rock (bays); harder rock forms headlands.
➀ Cliffs and Wave-Cut Platforms: Cliffs formed by relentless wave pounding; erosion creates flat platforms at the base.
➀ Caves, Arches, Stacks, Stumps: Waves carve caves in headlands β†’ grow into arches β†’ collapse into stacks β†’ eroded into stumps.

βœ… Depositional Landforms
➀ Beaches: Formed by accumulation of eroded rock fragments by wave action.
➀ Spits, Bars and Lagoons: Spits = sand extensions into sea; when connected across a bay = bars, forming lagoons behind.

βœ… Significance of Coastal Landforms
➀ Tourism Hubs: Especially beaches (major attractions).
➀ Mineral Resources: Beaches may contain gold (Subarnarekha River) & thorium (Kerala).

βœ… Threats of Coastal Erosion
➀ Vulnerable Coastlines: 33.6% of India’s coastline under threat; Odisha most affected (28%).
➀ Community Impact: Loss of boats, nets, fishing spaces; habitat destruction and displacement.

βœ… Government Measures to Prevent Erosion
➀ Mangrove planting & shelterbelts
➀ Installing Geo-tubes
➀ Rs. 2500 crore under 15th Finance Commission for resettlement of displaced families and mitigation efforts.

πŸ“ Prelims MCQ
Which of the following is a depositional coastal feature?

(a) Stack
(b) Cliff
(c) Lagoon
(d) Cave
βœ… Ans: (c) Lagoon


πŸ“ Mains Q (GS1 – Geography)
Discuss the formation and significance of coastal landforms. How is coastal erosion impacting India’s coastal communities and what measures are being taken to mitigate it?


#GS1 #Geography #CoastalErosion #DisasterMitigation
2025/07/08 21:25:48
Back to Top
HTML Embed Code: