请问名词可以修饰介词短语或从句吗?
下面有四个句子,
1、句子1中hours after the earthquake是名词hours作副词修饰after the earthquake啊,还是介词短语after the earthquake修饰hours；
2、句子2中months与 in advance的关系哪?
3、句子3中状语About three miles off the coast of the port请郭老师详细分析一下它们的修饰关系?
4、句子4中状语only minutes after the rocker takes off修饰关系哪?是only修饰minutes,only minutes修饰after the rocker takes off从句吗?
四个句子：
1、Scientists arrived at the scene hours after the earthquake.
2、Conferences to plan oceanographic ship cruises are usually held months in advance.
3、About three miles off the coast of the port,there is a small island.
4、The biggest stage at the bottom is thrown away only minutes after the rocker takes off.