zisin de tana no ue no hako ga otimasita

In this sentence, で marks the cause of what happened.

• 地震で = because of the earthquake / due to the earthquake

This is a very common use of で with events like:

• 雨で = because of the rain
• 事故で = because of an accident
• 火事で = because of a fire

So 地震で does not mean location here. It means the earthquake is the reason the box fell.

Both の link nouns together.

Break it down like this:

1. 棚の上
   = the top of the shelf / on the shelf

2. 棚の上の箱
   = the box on top of the shelf

So the first の connects 棚 and 上:

• 棚 = shelf
• 上 = top, upper part, above
• 棚の上 = the top of the shelf

Then the second の connects that whole phrase to 箱:

• 棚の上の箱 = the box that is on the shelf

This kind of noun-linking with の is extremely common in Japanese.

Because 落ちる is an intransitive verb.

• 落ちる = to fall
• 落とす = to drop something

With 落ちる, the thing that falls is the subject, so it takes が:

• 箱が落ちました = the box fell

If a person dropped the box, you would use the transitive verb 落とす, and the box would take を:

• 彼が箱を落としました = He dropped the box

This is a very common point for English speakers, because English often uses the same basic idea in a way that feels more object-focused, but Japanese clearly separates fall and drop.

Here, が marks 箱 as the subject of the verb 落ちました.

• 箱が落ちました = the box fell

Using が is natural when you are simply stating what happened.

If you used は, the nuance would change. は would make 箱 the topic, often with contrast or a broader context:

• 箱は落ちました
  = As for the box, it fell.

That can sound like:

• maybe other things did not fall
• or now we are specifically talking about the box

In a simple event report like this, が is the most natural choice.

Because 棚の上の箱 is a noun phrase, not a full location phrase for the verb.

Here, 棚の上 is directly modifying 箱:

• 棚の上の箱 = the box on the shelf

When Japanese uses a location to describe a noun, の is often used this way.

Compare:

• 棚の上の箱 = the box on the shelf
  → a noun phrase

• 箱は棚の上にあります = the box is on the shelf
  → a full sentence, where に marks location for あります

So に is not needed here because 棚の上 is part of a modifier before 箱, not the location marker of the main verb.

上 literally means up, top, or upper part. In Japanese, words like this are usually treated more like nouns than English-style prepositions.

So:

• 棚の上 = the top of the shelf / on the shelf
• literally, something like the shelf's top

Japanese often expresses location with these relational nouns:

• 上 = above / on top
• 下 = below / under
• 中 = inside
• 前 = in front
• 後ろ = behind
• 横 = beside

That is why the structure looks different from English.

Because Japanese normally puts the verb at the end of the sentence.

So this sentence follows a very typical Japanese pattern:

• 地震で = because of the earthquake
• 棚の上の箱が = the box on the shelf
• 落ちました = fell

Very roughly:

• [cause] [subject] [verb]

English speakers often want the verb earlier, but in Japanese it is normal to wait until the end for the main action.

落ちました is the polite past form of 落ちる.

• dictionary form: 落ちる
• polite non-past: 落ちます
• polite past: 落ちました

The past tense is used because the fall is being described as a completed event:

• the box fell

In Japanese, past tense is used very naturally for reporting something that happened, even if it happened only moments ago.

The plain-form version is:

地震で棚の上の箱が落ちた。

The difference is mainly politeness:

• 落ちました = polite
• 落ちた = plain/casual

So:

• 地震で棚の上の箱が落ちました。
  polite, neutral, common in careful speech

• 地震で棚の上の箱が落ちた。
  casual, plain style, common in conversation or informal writing

No. Japanese is normally written without spaces.

Natural writing would be:

地震で棚の上の箱が落ちました。

Spaces are often added only in teaching materials to make the structure easier for learners to see.

Yes. Japanese often leaves things compact, but you can expand it if you want to make the relationship clearer.

For example:

• 地震で、棚の上にあった箱が落ちました。
  = Because of the earthquake, the box that was on the shelf fell.

Here, 棚の上にあった箱 literally means the box that was on the shelf.

Your original sentence is shorter and very natural, but this expanded version can sometimes be easier for learners to understand because it spells out the location more fully.