MONSTER CRATER. “The Bouguer gravity anomaly shows a large well-defined semi-circular concentric anomaly pattern with amplitudes up to 30 mGals with a 40 km diameter central high and two lows at about 70 km and 120 km diameters (Figure 2). Semi- circular concentric anomalies were inferred at 52.5±5km,77.1±6.3 km, 99.6±6 km and 139 ± 11 km radial distance, which define a multi-ring structure with central peak ring limited by ring 1.”
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