Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 21-04-2023 and time 07:30:44 (Italy) in region 3 km SE Sant'Agata Feltria (RN)

A magnitude ML 0.9 earthquake occured in region: 3 km SE Sant'Agata Feltria (RN), on

  • 21-04-2023 05:30:44 (UTC)
  • 21-04-2023 07:30:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8400, 12.2300 at 19 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Sant'Agata Feltria RN 3 2151 2151
Pennabilli RN 4 2869 5020
Maiolo RN 8 848 5868
Novafeltria RN 8 7164 13032
Casteldelci RN 8 407 13439
Talamello RN 9 1104 14543
Montecopiolo PU 10 1128 15671
Carpegna PU 11 1674 17345
San Leo RN 11 2972 20317
Sarsina FC 11 3446 23763
Pietrarubbia PU 13 660 24423
Mercato Saraceno FC 13 6886 31309
Frontino PU 15 293 31602
Monte Cerignone PU 15 669 32271
Badia Tedalda AR 15 1087 33358
Sestino AR 16 1355 34713
Macerata Feltria PU 18 1990 36703
Belforte all'Isauro PU 18 769 37472
Verghereto FC 19 1907 39379
Sogliano al Rubicone FC 19 3195 42574
Piandimeleto PU 20 2167 44741
Monte Grimano Terme PU 20 1136 45877

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km S of Cesena (96758 inhabitants)
37 Km SW of Rimini (147750 inhabitants)
45 Km SE of Forlì (117913 inhabitants)
50 Km NE of Arezzo (99543 inhabitants)
55 Km W of Pesaro (94582 inhabitants)
57 Km SE of Faenza (58541 inhabitants)
63 Km W of Fano (60888 inhabitants)
64 Km S of Ravenna (159116 inhabitants)
70 Km SE of Imola (69797 inhabitants)
79 Km E of Firenze (382808 inhabitants)
83 Km N of Perugia (166134 inhabitants)
85 Km E of Scandicci (50609 inhabitants)
91 Km E of Prato (191150 inhabitants)
93 Km NE of Siena (53903 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 0.9 2023-04-21
05:30:44		 43.8403 12.2303 19 2024-03-01
17:18:20		 Bollettino Sismico Italiano INGV 125071681
Reviewed
Rev100 		Md 1.8 2023-04-21
05:30:43		 43.86 12.2362 10 2024-02-06
13:48:13		 Sala Sismica INGV-Roma 116565201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-21 05:30:44 ± 0.17
Latitude 43.8403 ± 0.0090
Longitude 12.2303 ± 0.0112
Depth (km) 19 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 125071681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1062
Semi-minor axis of confidence ellipse (meter) 255
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 38
Circular confidence region, given by single value of horizontal uncertainty (meter) 1060.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 177
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.07554
Epicentral distance of station farthest from the epicenter (degree) 0.51531
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 125071681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-06 13:47:47

Md:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 2
Type of magnitude Md
Reference to an origin 116565201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-21 07:15:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VMGN.HHN. 2023-04-21T05:31:02.95 0.6 undecidable manual S 283 57.1983 100 0.77 39
IV.ATBU.EHZ. 2023-04-21T05:31:00.83 0.6 undecidable manual S 148 47.8188 103 1.11 33
IV.LMD.HHE. 2023-04-21T05:31:00.77 0.6 undecidable manual S 302 49.3173 102 0.64 41
IV.MPAG.EHZ. 2023-04-21T05:31:00.89 0.6 undecidable manual S 119 48.4182 102 1 34
IV.PIEI.HHZ. 2023-04-21T05:30:58.17 0.6 undecidable manual S 144 41.7249 105 0.03 48
IV.TSM6.DH1.11 2023-04-21T05:30:58.42 0.3 undecidable manual S 169 41.625 105 0.3 68
IV.NARO.HHZ. 2023-04-21T05:30:57.30 0.6 undecidable manual S 132 37.9287 107 0.14 47
IV.BADI.EHZ. 2023-04-21T05:30:57.01 0.3 undecidable manual S 178 36.741 108 0.15 71
IV.CRE.HHZ. 2023-04-21T05:30:56.52 0.6 undecidable manual S 222 33.2445 110 0.55 44
IV.SFI.EHE. 2023-04-21T05:30:55.32 0.6 undecidable manual S 283 31.4463 111 -0.22 46
IV.VMGN.HHN. 2023-04-21T05:30:54.79 0.3 undecidable manual P 283 57.1983 100 0.18 68
IV.MPAG.EHZ. 2023-04-21T05:30:53.62 0.3 undecidable manual P 119 48.4182 102 0.33 66
IV.LMD.HHE. 2023-04-21T05:30:53.29 0.3 undecidable manual P 302 49.3173 102 -0.13 69
IV.PARC.HHZ. 2023-04-21T05:30:52.83 0.3 undecidable manual S 178 21.2676 123 -0.29 71
IV.TSM6.DH1.11 2023-04-21T05:30:52.15 0.3 undecidable manual P 169 41.625 105 -0.11 71
IV.BADI.EHZ. 2023-04-21T05:30:51.42 0.1 undecidable manual P 178 36.741 108 -0.12 95
IV.NARO.HHZ. 2023-04-21T05:30:51.60 0.3 undecidable manual P 132 37.9287 107 -0.11 72
IV.ATBU.EHZ. 2023-04-21T05:30:51.91 0.3 undecidable manual P 148 47.8188 103 -1.28 46
IV.PIEI.HHZ. 2023-04-21T05:30:51.92 0.3 undecidable manual P 144 41.7249 105 -0.35 67
IV.CPGN.EHZ. 2023-04-21T05:30:50.79 0.6 undecidable manual S 121 8.3805 152 0.02 50
IV.SFI.EHE. 2023-04-21T05:30:50.55 0.3 undecidable manual P 283 31.4463 111 -0.22 70
IV.CRE.HHZ. 2023-04-21T05:30:50.76 0.1 undecidable manual P 222 33.2445 110 -0.26 92
IV.PARC.HHZ. 2023-04-21T05:30:49.06 0.1 negative manual P 178 21.2676 123 -0.31 94
IV.CPGN.EHZ. 2023-04-21T05:30:47.88 0.1 undecidable manual P 121 8.3805 152 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PARC.HHN. ML:1.0 0.000059749999999999995 1.8 AML other m 2023-04-21T05:30:53.98
IV.PARC.HHE. ML:1.0 0.00005904999999999999 1.76 AML other m 2023-04-21T05:30:53.08
IV.NARO.HHN. ML:0.8 0.000020549999999999998 1.56 AML other m 2023-04-21T05:30:57.80
IV.NARO.HHE. ML:0.6 0.00001545 0.76 AML other m 2023-04-21T05:30:58.21
IV.FRON.EHE. ML:1.0 0.000018 1.4 AML other m 2023-04-21T05:30:59.71
IV.PIEI.HHE. ML:0.8 0.0000196 0.44 AML other m 2023-04-21T05:30:59.75
IV.PIEI.HHN. ML:0.7 0.00001375 1 AML other m 2023-04-21T05:31:00.54
IV.FRON.EHN. ML:1.3 0.0000459 0.28 AML other m 2023-04-21T05:31:00.78
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download