Fig 1.
Tr = 475yr hazard maps on rock according to three authoritative models for three intensity measures.
The panels in the same columns refer to the same model: (a), (d), (g) are from MPS04; (b), (e), (h) are from MPS19; (c), (f), (i) are from ESHM20. The panels in the same row refer to the same IM: (a), (b), (c) are PGA; (d), (e), (f) are Sa(0.3s); (g), (h), (i) are Sa(1.0s). The maps were generated using the Matlab mapping toolbox version 4.10 (https://it.mathworks.com/products/mapping.html).
Fig 2.
Earthquakes and stations considered in the study.
(a) M3.7+ mainshocks from 1973 to 2019 according to CPTI15. (b) Considered stations and their operating time (in terms of number of years). (c) Number of mainshocks within 200 km per station during operating time according to CPTI15. (d) number of recorded mainshocks for each station. The maps were generated using the Matlab mapping toolbox version 4.10 (https://it.mathworks.com/products/mapping.html).
Fig 3.
Mainshocks causing exceedance and stations experiencing exceedance.
(a) Map of the M3.7+ mainshocks from 1973 to 2019 according to CPTI15: grey are those causing no exceedances at any station within 200 km from the epicenter; bluish and reddish are those causing exceedance of at least one IM (among the three considered) with Tr = 50yr and Tr = 475yr, respectively. (b) Map of the stations experiencing no exceedance (grey) and those subjected to at least one exceedance of at least one IM with Tr = 50yr (bluish) and Tr = 475yr (reddish), for at least one hazard model. The maps were generated using the Matlab mapping toolbox version 4.10 (https://it.mathworks.com/products/mapping.html).
Fig 4.
Stations experiencing exceedance.
Maps of mainshock exceedance (and non-exceedance) at the stations of the IM thresholds with Tr = 50yr and Tr = 475yr. The panels in the same columns refer to the same model: (a), (d), (g) are from MPS04; (b), (e), (h) are from MPS19; (c), (f), (i) are from ESHM20. The panels in the same row refer to the same IM: (a), (b), (c) are PGA; (d), (e), (f) are Sa(0.3s); (g), (h), (i) are Sa(1.0s). The maps were generated using the Matlab mapping toolbox version 4.10 (https://it.mathworks.com/products/mapping.html).
Table 1.
Comparison between the non-rejection region and the number of exceedances collectively observed at the stations from 1973 to 2019 for intensity measure, return period, and hazard model.
Fig 5.
Results of the tests for Tr = 50yr.
Distribution of the total number of exceedances from 1973 to 2019 of the ground motion intensity with Tr = 50yr at 143 sites where continuously recording stations have been present, each in a time period, and total observed exceedances at the same stations. The panels in the same columns refer to the same model: (a), (d), (g) are from MPS04; (b), (e), (h) are from MPS19; (c), (f), (i) are from ESHM20. The panels in the same row refer to the same IM: (a), (b), (c) are PGA; (d), (e), (f) are Sa(0.3s); (g), (h), (i) are Sa(1.0s).
Fig 6.
Results of the tests for Tr = 475yr.
Distribution of the total number of exceedances from 1973 to 2019 of the ground motion intensity with Tr = 475yr at 143 sites where continuously recording stations have been present, each in a time period, and total observed exceedances at the same stations. The panels in the same columns refer to the same model: (a), (d), (g) are from MPS04; (b), (e), (h) are from MPS19; (c), (f), (i) are from ESHM20. The panels in the same row refer to the same IM: (a), (b), (c) are PGA; (d), (e), (f) are Sa(0.3s); (g), (h), (i) are Sa(1.0s).