science

NORSAR

NORSAR is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand NORSAR rather than just read about it. In short: NORSAR is a foundation established in 1968 as part of the Norwegian–US agreement for the detection of earthquakes and nuclear explosions. The name derives from the foundation's original project, the Norwegian Seismic Array.

Key takeaways

NORSAR belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NORSAR to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NORSAR from memory before moving on to harder problems.

Reference excerpt

NORSAR is a foundation established in 1968 as part of the Norwegian–US agreement for the detection of earthquakes and nuclear explosions. The name derives from the foundation's original project, the Norwegian Seismic Array.

Description Located at Kjeller, north of Oslo, NORSAR runs and maintains seismic arrays in Norway and it is the designated Norwegian National Data Centre for the Comprehensive Nuclear-Test-Ban Treaty. NORSAR conducts basic seismological research, develops software and provides consultancy for the petroleum industry.

NORSAR was the first non-US site included in ARPANET in June 1973. Its connection went via the Tanum Earth Station in Sweden to the Seismic Data Analysis Center (SDAC) in Virginia, United States. In turn, NORSAR provided the connection point for ARPANET to spread to Peter Kirstein's research group at University College London (UCL) the following month in July 1973. Connecting through NORSAR, the Norwegian Defence Research Establishment (NDRE), along with UCL and RSRE in Britain, were involved in testing TCP/IP. UCL provided a gateway between the ARPANET and UK academic computer networks, the first heterogenous international computer network. In early 1982, NORSAR and UCL left the ARPANET and began to use TCP/IP over SATNET, becoming two of the first nodes on the Internet. Since 1999, NORSAR has been an independent research foundation.

Illustrations

NORSAR logo

Worked examples

Example 1 — a first encounter with NORSAR

Start with the simplest possible case. Write down what NORSAR claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to NORSAR before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about NORSAR ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of NORSAR

In research: NORSAR appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses NORSAR in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: NORSAR is common in secondary-school and first-year university syllabi. It links to neighbouring topics Earth science research institutes, Foundations based in Norway, Government agencies of Norway, so understanding it makes those chapters shorter.
In everyday life: Look for NORSAR outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study NORSAR in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NORSAR means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain NORSAR out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NORSAR in simple terms?

Why does NORSAR matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study NORSAR?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on NORSAR.