21. The Kronstadt sea-gauge with the tide gauge pavilion is the zero level of the Baltic system of depths and heights. 22. A minor tsunami was reported, which was recorded by a temporary tide gauge , giving a maximum height of 1 m. 23. Over the last century, tide gauges indicated an average sea-level rise of four-hundredths to eight-hundredths of an inch a year. 24. The pier is home to a tide gauge with a sporadic history, showing an above average rate of sea level rise. 25. However, further work with long tide gauges records revealed that sea level acceleration may have started earlier, over 200 years ago. 26. When it comes to estimating the greater ocean picture, new modern tide gauges can often be improved upon by using satellite data. 27. Decades of data collected from the ground, using tide gauges placed along the coasts, have generally shown that ocean levels are rising. 28. This network of tide gauges and buoys helps the center to validate the arrivals of tsunami waves in the Indian Ocean region. 29. Cm / year, based on measurements of sea level rise from 23 long tide gauge records in geologically stable environments . }} 30. The tide gauge hut, constructed in 1970, is timber framed with fibre cement sheeting, a galvanised metal deck and an aluminium louvre mechanism.
