strange loop in the forward wavefield #1716
zuoxuan-de
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When I perform forward modeling of various homogeneous elastic media, after the source is excited for a period of time, a small circle with weak energy will appear again, independent of the initial wave.
![forward_image000001000](https://private-user-images.githubusercontent.com/129966017/321928386-d6ea0ce2-0964-41c5-9699-1aecab9d60c3.jpg?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Mzk5NTQxNTUsIm5iZiI6MTczOTk1Mzg1NSwicGF0aCI6Ii8xMjk5NjYwMTcvMzIxOTI4Mzg2LWQ2ZWEwY2UyLTA5NjQtNDFjNS05Njk5LTFhZWNhYjlkNjBjMy5qcGc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMjE5JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDIxOVQwODMwNTVaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1hOWRhYzg5OGFjZTc4MDgzNTkwOWNiMDQ1ZTYyMTQ2MjgwZjg3NGM4MDRlOTVlZWNjOTk5NjU0YWM4MjVlYzljJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.i8J8zBvIzTe4eKPykSLhLe1Gj2ldcmedBP1hFlc4sF0)
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