---
title: "Strike of limestone bed inclined east at 45°"
subject: "Engineering Geology I"
chapter: 5
key: "semester_3/engineering_geology_i:strike-of-limestone-bed-inclined"
source: https://www.bctengineer.com/q/semester_3/engineering_geology_i/strike-of-limestone-bed-inclined
site: BCT Engineering
---

# Strike of limestone bed inclined east at 45°

Engineering Geology I · Chapter 5: Structural Geology

- Asked in: 2078 Kartik, 2 marks
- Video: [TRUE DIP AND STRIKE DIRECTION NUMERICAL | geology ii | IOE | TU | EASY METHOD |](https://www.youtube.com/watch?v=6vDE-l2E4vQ) — Bishal Khadka
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_3/engineering_geology_i/strike-of-limestone-bed-inclined
- Whole chapter: https://www.bctengineer.com/md/semester_3/engineering_geology_i/chapter-5

## Question

The limestone bed is inclined towards east with an inclination angle of 45°. Find the strike.

## Short answer

Inclined towards east means dip direction is due east (90°). Strike is perpendicular, so north-south (0°/180°). Strike is N–S, dipping 45° east.

## Answer

The bed is inclined towards the east, so the dip direction is due east (azimuth 90°). Strike is at 90° to the dip direction.

$$
\text{Strike} = 90° \pm 90° = 0° \ \text{or}\ 180°
$$

Hence the strike is **north-south (N-S)**, written N00°E. The bed strikes N-S and dips 45° towards the east.

```text
            N
            |  strike (N-S)
            |
     W -----+------> E  dip direction
            |
            S
```

**Answer: Strike = N-S (0°/180°).**

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. A bed inclined towards the east has a dip direction azimuth of
   A. 0°
   B. 90°
   C. 180°
   D. 270°
   Answer: B. East is 90° from north. (Key point: Dip direction)

2. What is the strike of a bed dipping east?
   A. East-west
   B. N45°E
   C. North-south (N-S)
   D. N45°W
   Answer: C. Strike = 90° +/- 90° = 0° or 180°. (Key point: Strike)

3. Does the 45° inclination affect the strike?
   A. No, strike depends only on dip direction
   B. Yes, strike becomes N45°E
   C. Yes, strike becomes E-W
   D. Yes, strike equals 45°
   Answer: A. Dip amount is independent of strike. (Key point: Role of dip angle)

## Related in Engineering Geology I

- [Strike of limestone bed directed N20°E, dip 45°](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Astrike-of-limestone-bed-directed) — Engineering Geology I, chapter 5
- [Strike of quartzite bed towards S20°W](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Astrike-of-quartzite-bed-towards) — Engineering Geology I, chapter 5
- [Strike of limestone bed dipping S55°E](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Astrike-of-limestone-bed-dipping) — Engineering Geology I, chapter 5
- [Strike of quartzite bed, dip 70° towards S20°E](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Astrike-of-quartzite-bed-dip) — Engineering Geology I, chapter 5
- [Strike of quartzite bed, dip 80° towards N10°E](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Astrike-of-quartzite-bed-dip-80) — Engineering Geology I, chapter 5
- [Strike of limestone bed, dip N40°W, 64°](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Astrike-of-limestone-bed-dip) — Engineering Geology I, chapter 5