Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 25-08-2021 and time 05:47:38 (Italy) in region 4 km SW Castelsantangelo sul Nera (MC)

A magnitude ML 1.8 earthquake occured in region: 4 km SW Castelsantangelo sul Nera (MC), on

  • 25-08-2021 03:47:38 (UTC)
  • 25-08-2021 05:47:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8630, 13.1240 at 9 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
Castelsantangelo sul Nera MC 4 281 281
Preci PG 7 724 1005
Visso MC 8 1107 2112
Norcia PG 8 4957 7069
Ussita MC 9 444 7513
Sellano PG 16 1079 8592
Bolognola MC 17 142 8734
Montemonaco AP 17 604 9338
Montegallo AP 17 523 9861
Arquata del Tronto AP 17 1178 11039
Cerreto di Spoleto PG 18 1075 12114
Monte Cavallo MC 18 145 12259
Cascia PG 18 3217 15476
Acquacanina MC 19 121 15597
Fiastra MC 20 559 16156
Fiordimonte MC 20 202 16358
Montefortino FM 20 1178 17536

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
51 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
61 Km NW of L'Aquila (69753 inhabitants)
66 Km E of Perugia (166134 inhabitants)
90 Km SW of Ancona (100861 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
97 Km NE of Viterbo (67173 inhabitants)
100 Km W of Pescara (121014 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 1.8 2021-08-25
03:47:38		 42.8632 13.1243 9 2021-12-29
11:12:29		 Bollettino Sismico Italiano INGV 95260731
Reviewed
Rev100 		ML 1.8 2021-08-25
03:47:38		 42.8587 13.13 8 2021-08-25
03:55:09		 Sala Sismica INGV-Roma 94607171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-25 03:47:38 ± 0.04
Latitude 42.8632 ± 0.0027
Longitude 13.1243 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95260731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 250
Semi-minor axis of confidence ellipse (meter) 237
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 38
Number of associated phases, regardless of their use for origin computation 53
Number of defining phases 51
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.84536
Number of stations at which the event was observed 39
Number of stations from which data was used for origin computation 37
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 71
Type of magnitude ML
Reference to an origin 95260731
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-10 07:57:38

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 71
Type of magnitude ML
Reference to an origin 94607171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-25 03:55:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NARO.HHZ. 2021-08-25T03:47:54.31 0.3 undecidable manual P 332 93.8394 50 -0.16 62
IV.ATVO.HHZ. 2021-08-25T03:47:53.02 0.3 undecidable manual P 315 81.7515 50 0.41 60
IV.MTCE.HHZ. 2021-08-25T03:47:53.04 3.0 undecidable manual P -2.77 0
IV.RM33.EHZ. 2021-08-25T03:47:51.79 0.1 undecidable manual S 169 39.9267 50 -0.13 91
IV.FAGN.HHZ. 2021-08-25T03:47:51.75 0.3 undecidable manual P 150 76.1682 50 0.01 66
IV.ATFO.HHZ. 2021-08-25T03:47:50.08 0.3 undecidable manual P 321 71.5728 50 -0.95 50
IV.MURB.HHZ. 2021-08-25T03:47:50.21 0.3 undecidable manual P 313 65.7897 50 0.07 66
IV.MF5.EHZ. 2021-08-25T03:47:49.87 0.3 undecidable manual S 63 30.5472 106 0.55 63
IV.SMA1.EHZ. 2021-08-25T03:47:49.33 0.3 undecidable manual S 146 31.0467 106 -0.14 69
IV.T1299.HNZ. 2021-08-25T03:47:49.06 0.3 undecidable manual S 153 28.4493 107 0.43 66
IV.FIAM.HHZ. 2021-08-25T03:47:49.82 0.3 undecidable manual P 181 65.9895 50 -0.35 62
IV.ATCC.EHZ. 2021-08-25T03:47:48.18 0.1 undecidable manual P 312 53.1024 50 0 92
IV.LNSS.HHZ. 2021-08-25T03:47:48.94 0.3 undecidable manual S 193 29.6481 107 -0.09 70
IV.CING.HHZ. 2021-08-25T03:47:48.50 0.3 undecidable manual P 6 57.0984 50 -0.3 64
IV.CESX.HHZ. 2021-08-25T03:47:48.02 0.1 undecidable manual P 237 52.1034 50 -0.01 92
IV.GAVE.EHZ. 2021-08-25T03:47:48.60 0.1 undecidable manual S 225 26.6511 108 0.57 84
IV.FOSV.EHZ. 2021-08-25T03:47:48.64 0.3 undecidable manual P 329 56.1993 50 -0.02 68
IV.GUMA.HHZ. 2021-08-25T03:47:48.61 0.1 undecidable manual S 38 27.9498 107 0.14 93
IV.EL6.EHZ. 2021-08-25T03:47:47.76 0.1 undecidable manual P 358 51.7038 50 -0.21 88
IV.CSP1.EHZ. 2021-08-25T03:47:47.58 0.1 undecidable manual S 14 26.1516 109 -0.3 90
IV.TERO.HHZ. 2021-08-25T03:47:47.10 0.3 undecidable manual P 124 47.3193 50 -0.19 67
IV.CESI.HHZ. 2021-08-25T03:47:47.35 0.6 undecidable manual S 311 23.754 110 0.26 46
IT.GNU.HGN. 2021-08-25T03:47:47.56 3.0 undecidable manual P 0.31 0
IV.MOMA.HHZ. 2021-08-25T03:47:47.12 0.1 undecidable manual P 262 45.621 50 0.1 91
IV.OFFI.HHZ. 2021-08-25T03:47:47.80 0.1 undecidable manual P 80 46.3203 50 0.67 78
IV.MNTT.EHZ. 2021-08-25T03:47:47.34 0.1 undecidable manual P 60 44.1225 50 0.54 83
IV.ARRO.EHZ. 2021-08-25T03:47:46.61 0.1 undecidable manual P 223 43.0236 50 -0.01 93
IV.CAMP.HHZ. 2021-08-25T03:47:46.31 0.3 undecidable manual P 147 43.1235 50 -0.33 65
IV.ASSB.HHZ. 2021-08-25T03:47:46.54 0.3 undecidable manual P 298 42.7239 50 -0.04 69
IV.MNTP.HNZ. 2021-08-25T03:47:46.83 0.1 undecidable manual P 42 41.3253 50 0.46 85
IV.FDMO.HHZ. 2021-08-25T03:47:45.70 0.6 undecidable manual S 351 19.4694 114 0 49
IV.RM33.EHZ. 2021-08-25T03:47:45.99 0.1 positive manual P 169 39.9267 50 -0.17 91
IV.SAP2.EHZ. 2021-08-25T03:47:45.26 0.3 undecidable manual P 41 34.1436 50 -0.01 71
IV.MML1.EHZ. 2021-08-25T03:47:44.48 0.1 undecidable manual P 336 30.4473 106 -0.15 93
IV.GUMA.HHZ. 2021-08-25T03:47:44.27 0.1 positive manual P 38 27.9498 107 0.1 94
IV.PF6.EHN. 2021-08-25T03:47:44.20 0.1 undecidable manual P 11 31.0467 106 -0.55 84
IV.T1299.HNZ. 2021-08-25T03:47:44.39 0.1 undecidable manual P 153 28.4493 107 0.13 93
IV.LNSS.HHZ. 2021-08-25T03:47:44.40 0.1 undecidable manual P 193 29.6481 107 -0.09 94
IV.MF5.EHZ. 2021-08-25T03:47:44.73 0.1 undecidable manual P 63 30.5472 106 0.07 94
IV.SMA1.EHZ. 2021-08-25T03:47:44.41 0.1 undecidable manual P 146 31.0467 106 -0.34 89
IV.MMO1.EHZ. 2021-08-25T03:47:44.68 0.1 undecidable manual S 76 16.9719 117 -0.23 93
IV.GAVE.EHZ. 2021-08-25T03:47:44.13 0.1 positive manual P 225 26.6511 108 0.22 92
IV.FEMA.HNZ. 2021-08-25T03:47:43.81 0.3 undecidable manual S 331 12.5763 125 0.2 71
IV.CSP1.EHZ. 2021-08-25T03:47:43.62 0.1 positive manual P 14 26.1516 109 -0.21 92
IV.CESI.HHZ. 2021-08-25T03:47:43.53 0.1 undecidable manual P 311 23.754 110 0.16 94
IV.MTRA.EHZ. 2021-08-25T03:47:43.60 0.3 undecidable manual P 118 25.0527 109 -0.02 72
IV.MMO1.EHZ. 2021-08-25T03:47:42.05 0.1 positive manual P 76 16.9719 117 -0.06 96
IV.MC2.EHZ. 2021-08-25T03:47:42.39 0.3 undecidable manual S 44 7.4814 140 0.09 73
IV.FDMO.HHZ. 2021-08-25T03:47:42.54 0.1 undecidable manual P 351 19.4694 114 -0.03 97
IV.NRCA.HHZ. 2021-08-25T03:47:41.00 0.3 undecidable manual S 194 3.3966 159 -0.56 66
IV.FEMA.HNZ. 2021-08-25T03:47:41.63 0.3 undecidable manual P 331 12.5763 125 0.27 70
IV.NRCA.HHZ. 2021-08-25T03:47:40.18 0.1 positive manual P 194 3.3966 159 0 100
IV.MC2.EHZ. 2021-08-25T03:47:40.62 0.1 positive manual P 44 7.4814 140 0.01 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:1.8 0.00052229845 0.2592 AML other m 2021-08-25T03:47:47.28
IV.CESI.HNE. ML:1.6 0.00027159565 0.4416 AML other m 2021-08-25T03:47:47.62
IV.FDMO.HHE. ML:1.7 0.00042411319999999996 0.1792 AML other m 2021-08-25T03:47:47.72
IV.CESI.HHN. ML:1.9 0.00055 0.16 AML other m 2021-08-25T03:47:47.78
IV.CESI.HNN. ML:1.9 0.0005253898 0.1504 AML other m 2021-08-25T03:47:47.78
IV.CESI.HHE. ML:1.6 0.000239503515 0.1216 AML other m 2021-08-25T03:47:47.86
IV.MTRA.HNN. ML:1.9 0.00044453679999999993 0.2016 AML other m 2021-08-25T03:47:48.44
IV.MTRA.EHN. ML:1.9 0.00043510475000000005 0.2016 AML other m 2021-08-25T03:47:48.34
IV.CSP1.EHE. ML:2.2 0.00085991895 0.3584 AML other m 2021-08-25T03:47:48.27
IV.MML1.HNN. ML:1.8 0.00028760855 0.2016 AML other m 2021-08-25T03:47:49.39
IV.MML1.EHN. ML:1.8 0.000286 0.2 AML other m 2021-08-25T03:47:49.39
IV.MTRA.EHE. ML:1.8 0.00038274345 0.2208 AML other m 2021-08-25T03:47:49.39
IV.CSP1.EHN. ML:2.2 0.0009597934500000001 0.4 AML other m 2021-08-25T03:47:49.48
IV.MTRA.HNE. ML:1.8 0.0003649944 0.1888 AML other m 2021-08-25T03:47:49.99
IV.GAVE.HNE. ML:2.1 0.00079663065 0.1504 AML other m 2021-08-25T03:47:49.97
IV.GAVE.EHE. ML:2.2 0.000816 0.16 AML other m 2021-08-25T03:47:49.90
IV.MF5.EHE. ML:1.9 0.00039200000000000004 0.24 AML other m 2021-08-25T03:47:50.34
IV.LNSS.HNN. ML:1.9 0.00040809580000000003 0.1504 AML other m 2021-08-25T03:47:50.51
IV.LNSS.HHN. ML:2.0 0.00052048725 0.1408 AML other m 2021-08-25T03:47:50.51
IV.GAVE.HNN. ML:1.5 0.00016198363500000002 0.1696 AML other m 2021-08-25T03:47:50.54
IV.MF5.EHN. ML:1.8 0.0002889171 0.2784 AML other m 2021-08-25T03:47:50.49
IV.LNSS.HHE. ML:2.0 0.00046499999999999997 0.12 AML other m 2021-08-25T03:47:50.70
IV.SAP2.EHE. ML:1.8 0.00027280570000000006 0.1216 AML other m 2021-08-25T03:47:51.49
IV.GAVE.EHN. ML:2.0 0.00054692965 0.2016 AML other m 2021-08-25T03:47:51.69
IV.MML1.HNE. ML:1.7 0.00023710375 1.7984 AML other m 2021-08-25T03:47:51.01
IV.MML1.EHE. ML:1.7 0.00023232255000000003 1.7984 AML other m 2021-08-25T03:47:51.02
IV.RM33.HNN. ML:2.0 0.00031178285 0.2688 AML other m 2021-08-25T03:47:52.31
IV.RM33.EHN. ML:2.0 0.0003154194 0.2592 AML other m 2021-08-25T03:47:52.45
IV.SMA1.EHN. ML:1.5 0.0001632474 0.16 AML other m 2021-08-25T03:47:53.82
IV.ASSB.HHE. ML:1.6 0.00012331444999999998 0.08 AML other m 2021-08-25T03:47:53.80
IV.ATVO.HHN. ML:1.4 0.00003331991 1.6608 AML other m 2021-08-25T03:47:53.87
IV.ASSB.HHN. ML:1.6 0.00012324547 0.1408 AML other m 2021-08-25T03:47:53.88
IV.TERO.HHN. ML:1.7 0.00012960475 1.9008 AML other m 2021-08-25T03:47:53.98
IV.RM33.HNE. ML:1.8 0.00022668598 0.1216 AML other m 2021-08-25T03:47:54.06
IV.RM33.EHE. ML:1.8 0.00019960495 0.1216 AML other m 2021-08-25T03:47:54.06
IV.TERO.HHE. ML:1.6 0.00012394885 0.0992 AML other m 2021-08-25T03:47:54.12
IV.SAP2.EHN. ML:2.6 0.00164705195 0.1984 AML other m 2021-08-25T03:47:54.07
IV.MOMA.HHE. ML:1.9 0.00022649999999999998 0.18 AML other m 2021-08-25T03:47:54.90
IV.MOMA.HNE. ML:1.8 0.00020702415 0.1824 AML other m 2021-08-25T03:47:54.81
IV.ARRO.EHE. ML:1.6 0.00011365 0.16 AML other m 2021-08-25T03:47:55.18
IV.MOMA.HHN. ML:1.8 0.000164 0.34 AML other m 2021-08-25T03:47:55.39
IV.OFFI.HHN. ML:1.9 0.0002514032 0.9216 AML other m 2021-08-25T03:47:55.76
IV.MNTT.EHN. ML:2.2 0.00053340075 0.16 AML other m 2021-08-25T03:47:55.34
IV.MNTT.EHE. ML:2.2 0.0005424668500000001 0.2176 AML other m 2021-08-25T03:47:55.42
IV.EL6.EHE. ML:1.9 0.0002154735 0.2016 AML other m 2021-08-25T03:47:55.80
IV.ARRO.EHN. ML:1.4 0.000085640555 0.2784 AML other m 2021-08-25T03:47:56.36
IV.TERO.HNE. ML:1.6 0.00012361725000000002 0.1216 AML other m 2021-08-25T03:47:56.32
IV.EL6.EHN. ML:2.0 0.0002695 0.26 AML other m 2021-08-25T03:47:56.36
IV.FOSV.EHE. ML:1.5 0.00007090134399999999 0.16 AML other m 2021-08-25T03:47:57.13
IV.MOMA.HNN. ML:1.6 0.00011454934999999999 0.2208 AML other m 2021-08-25T03:47:57.15
IV.ATCC.EHN. ML:1.5 0.000086029715 0.1216 AML other m 2021-08-25T03:47:57.42
IV.SMA1.EHE. ML:1.6 0.00018727115 0.5216 AML other m 2021-08-25T03:47:57.26
IV.FOSV.EHN. ML:1.6 0.000095169425 0.32 AML other m 2021-08-25T03:47:57.52
IV.CESX.HHN. ML:1.5 0.00007748569999999999 0.2016 AML other m 2021-08-25T03:47:58.84
IV.CESX.HHE. ML:1.6 0.0000935 0.3 AML other m 2021-08-25T03:48:00.45
IV.ATCC.EHE. ML:1.6 0.00009580576000000001 0.3008 AML other m 2021-08-25T03:48:00.47
IV.FIAM.HHN. ML:1.3 0.0000404 1.14 AML other m 2021-08-25T03:48:00.66
IV.FIAM.HHE. ML:1.3 0.000034500000000000005 1.76 AML other m 2021-08-25T03:48:00.10
IV.OFFI.HHE. ML:1.8 0.00017372825 0.96 AML other m 2021-08-25T03:48:04.15
IV.MURB.HNN. ML:1.9 0.0001411197 0.2592 AML other m 2021-08-25T03:48:05.64
IV.MURB.HHN. ML:1.9 0.00014228795 0.2208 AML other m 2021-08-25T03:48:05.77
IV.ATFO.HHN. ML:1.4 0.00004085855 0.56 AML other m 2021-08-25T03:48:05.66
IV.MURB.HNE. ML:2.0 0.00018042715 0.2496 AML other m 2021-08-25T03:48:05.95
IV.MURB.HHE. ML:2.0 0.000167 0.26 AML other m 2021-08-25T03:48:05.96
IV.FAGN.HHE. ML:1.9 0.000118 0.42 AML other m 2021-08-25T03:48:07.43
IV.FIAM.HNE. ML:3.1 0.002249169 0 AML other m 2021-08-25T03:48:08.41
IV.TERO.HNN. ML:1.7 0.000155154185 0.7104 AML other m 2021-08-25T03:48:09.87
IV.FIAM.HNN. ML:1.9 0.00015364215 0.7104 AML other m 2021-08-25T03:48:10.21
IV.FAGN.HHN. ML:1.8 0.00008410000000000001 1.54 AML other m 2021-08-25T03:48:14.06
IV.ATFO.HHE. ML:1.4 0.000040739035 1.44 AML other m 2021-08-25T03:48:14.94
IV.ATVO.HHE. ML:1.4 0.000028970895 1.0592 AML other m 2021-08-25T03:48:27.07
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