Figure 1

Location map showing sampling site in the Dalian Bay, China. The sampling site was shown for square, and explosion site was shown for pentagon. The figure map was generated by using software Google Earth (open-access version: 7.1.5.1557)(Data SIO, NOAA, U.S. NAVY, NGA, GEBCO, Image@2017 TerraMetrics) and the tracing drafted by using software CorelDRAW (Graphics Suite × 6, source ID: 017002) (http://www.coreldraw.com/en/product/graphic-design-software). The sampling sites were located by using Global Positioning System (GPS).