Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-08-2021 and time 23:37:57 (Italy) in region 3 km SE Castelsantangelo sul Nera (MC)

A magnitude ML 1.7 earthquake occured in region: 3 km SE Castelsantangelo sul Nera (MC), on

  • 23-08-2021 21:37:57 (UTC)
  • 23-08-2021 23:37:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8780, 13.1880 at 8 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 3 281 281
Ussita MC 8 444 725
Visso MC 10 1107 1832
Montemonaco AP 12 604 2436
Preci PG 12 724 3160
Norcia PG 12 4957 8117
Montegallo AP 13 523 8640
Bolognola MC 13 142 8782
Montefortino FM 15 1178 9960
Arquata del Tronto AP 15 1178 11138
Acquacanina MC 17 121 11259
Fiastra MC 18 559 11818
Amandola FM 18 3629 15447
Fiordimonte MC 19 202 15649
Sarnano MC 20 3264 18913
Monte Cavallo MC 20 145 19058

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Foligno (57155 inhabitants)
49 Km NW of Teramo (54892 inhabitants)
57 Km NE of Terni (111501 inhabitants)
61 Km N of L'Aquila (69753 inhabitants)
70 Km E of Perugia (166134 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
88 Km W of Montesilvano (53738 inhabitants)
96 Km W of Pescara (121014 inhabitants)
99 Km NW of Chieti (51815 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 1.7 2021-08-23
21:37:57		 42.8785 13.1878 8 2021-12-29
11:12:40		 Bollettino Sismico Italiano INGV 97037401
Reviewed
Rev100 		ML 1.8 2021-08-23
21:37:57		 42.8808 13.1872 7 2021-08-23
21:45:06		 Sala Sismica INGV-Roma 94552821
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-23 21:37:57 ± 0.04
Latitude 42.8785 ± 0.0018
Longitude 13.1878 ± 0.0037
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97037401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 260
Semi-minor axis of confidence ellipse (meter) 60
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 74
Circular confidence region, given by single value of horizontal uncertainty (meter) 260.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 63
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 46
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.03327
Epicentral distance of station farthest from the epicenter (degree) 0.61783
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 33
Type of magnitude ML
Reference to an origin 97037401
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-28 09:11:43

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 94552821
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-23 21:45:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATCC.EHZ. 2021-08-23T21:38:15.32 1.0 undecidable manual S 308 55.9995 50 -0.05 23
IV.EL6.EHZ. 2021-08-23T21:38:14.34 0.3 undecidable manual S 352 50.5161 50 0.43 65
IV.TERO.HHZ. 2021-08-23T21:38:12.08 0.3 undecidable manual S 130 44.2224 50 -0.16 70
IV.CAMP.HHE. 2021-08-23T21:38:11.30 0.6 undecidable manual S 155 42.0246 50 -0.37 45
IV.RM33.HNE. 2021-08-23T21:38:11.56 0.3 undecidable manual S 177 41.0256 50 0.17 70
IV.LNSS.HHZ. 2021-08-23T21:38:09.14 0.3 undecidable manual S 202 32.8449 104 0.06 72
IV.MURB.HHZ. 2021-08-23T21:38:09.92 0.6 undecidable manual P 309 68.5758 50 0.22 44
IV.GAVE.EHZ. 2021-08-23T21:38:08.85 0.3 undecidable manual S 229 31.6461 104 0.2 71
IV.MML1.HNE. 2021-08-23T21:38:08.36 0.6 undecidable manual S 326 31.4463 105 -0.23 47
IV.ATCC.EHZ. 2021-08-23T21:38:07.69 0.3 undecidable manual P 308 55.9995 50 -0.06 70
IV.SMA1.EHZ. 2021-08-23T21:38:07.94 0.3 undecidable manual S 156 30.0477 105 -0.18 71
IV.T1299.EHZ. 2021-08-23T21:38:07.85 0.3 undecidable manual S 164 28.1496 106 0.35 69
IV.PF6.EHN. 2021-08-23T21:38:07.47 0.6 undecidable manual S 1 28.749 106 -0.24 47
IV.MF5.EHZ. 2021-08-23T21:38:06.89 0.6 undecidable manual S 61 25.1526 108 0.38 46
IV.CESI.HHZ. 2021-08-23T21:38:06.82 0.3 undecidable manual S 301 26.9508 107 -0.28 70
IV.EL6.EHZ. 2021-08-23T21:38:06.82 0.6 undecidable manual P 352 50.5161 50 -0.09 47
IV.GUMA.HHZ. 2021-08-23T21:38:06.31 0.3 undecidable manual S 30 23.6541 109 0.3 70
IV.ASSB.HHZ. 2021-08-23T21:38:06.16 0.3 undecidable manual P 293 46.62 50 -0.16 69
IV.MTRA.EHZ. 2021-08-23T21:38:05.42 0.3 undecidable manual S 128 21.6672 111 0.05 74
IV.MNTT.EHZ. 2021-08-23T21:38:05.51 0.3 undecidable manual P 58 38.8278 50 0.4 67
IV.CSP1.EHZ. 2021-08-23T21:38:05.68 0.3 undecidable manual S 3 23.6541 109 -0.34 69
IV.CAMP.HHE. 2021-08-23T21:38:05.25 0.3 undecidable manual P 155 42.0246 50 -0.36 67
IV.TERO.HHZ. 2021-08-23T21:38:05.58 0.3 undecidable manual P 130 44.2224 50 -0.36 67
IV.RM33.HNE. 2021-08-23T21:38:05.23 0.3 undecidable manual P 177 41.0256 50 -0.22 69
IV.FDMO.HHZ. 2021-08-23T21:38:04.42 0.3 undecidable manual S 335 19.3695 113 -0.19 72
IV.LNSS.HHZ. 2021-08-23T21:38:04.20 0.3 undecidable manual P 202 32.8449 104 0.09 72
IV.T1299.EHZ. 2021-08-23T21:38:03.32 0.3 undecidable manual P 164 28.1496 106 0.12 72
IV.PF6.EHN. 2021-08-23T21:38:03.74 0.6 undecidable manual P 1 28.749 106 0.42 45
IV.GAVE.EHZ. 2021-08-23T21:38:03.96 0.3 undecidable manual P 229 31.6461 104 0.09 72
IV.MML1.HNE. 2021-08-23T21:38:03.59 0.3 undecidable manual P 326 31.4463 105 -0.24 70
IV.FEMA.HNZ. 2021-08-23T21:38:03.50 0.3 undecidable manual S 310 14.5743 119 0.38 70
IV.SMA1.EHZ. 2021-08-23T21:38:03.28 0.1 undecidable manual P 156 30.0477 105 -0.28 93
IV.SAP2.EHZ. 2021-08-23T21:38:03.76 0.6 undecidable manual P 35 29.6481 105 0.27 47
IV.GUMA.HHZ. 2021-08-23T21:38:02.50 0.1 undecidable manual P 30 23.6541 109 0.16 96
IV.MF5.EHZ. 2021-08-23T21:38:02.88 0.1 undecidable manual P 61 25.1526 108 0.25 94
IV.MTRA.EHZ. 2021-08-23T21:38:02.03 0.1 undecidable manual P 128 21.6672 111 0.06 99
IV.CESI.HHZ. 2021-08-23T21:38:02.94 0.1 undecidable manual P 301 26.9508 107 -0.03 98
IV.CSP1.EHZ. 2021-08-23T21:38:02.22 0.1 undecidable manual P 3 23.6541 109 -0.13 97
IV.FDMO.HHZ. 2021-08-23T21:38:01.47 0.1 undecidable manual P 335 19.3695 113 -0.06 99
IV.NRCA.HNZ. 2021-08-23T21:38:01.24 0.3 undecidable manual S 230 7.7811 136 0 77
IV.MMO1.EHZ. 2021-08-23T21:38:01.99 0.3 undecidable manual S 78 11.4774 125 -0.23 73
IV.MMO1.EHZ. 2021-08-23T21:38:00.08 0.1 undecidable manual P 78 11.4774 125 -0.08 100
IV.MC2.EHZ. 2021-08-23T21:38:00.10 0.3 undecidable manual S 1 3.6963 156 -0.32 72
IV.FEMA.HNZ. 2021-08-23T21:38:00.87 0.3 undecidable manual P 310 14.5743 119 0.2 73
IV.NRCA.HNZ. 2021-08-23T21:37:59.87 0.1 undecidable manual P 230 7.7811 136 0.28 96
IV.MC2.EHZ. 2021-08-23T21:37:58.96 0.1 undecidable manual P 1 3.6963 156 -0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:2.4 0.0039774254999999994 0.1408 AML other m 2021-08-23T21:38:01.63
IV.NRCA.HHE. ML:2.4 0.004125179499999999 0.1408 AML other m 2021-08-23T21:38:01.63
IV.NRCA.HNN. ML:2.3 0.0033037465 0.1152 AML other m 2021-08-23T21:38:01.87
IV.NRCA.HHN. ML:2.4 0.0037426070000000002 0.1408 AML other m 2021-08-23T21:38:01.61
IV.FDMO.HHE. ML:1.3 0.0001774646 0.1792 AML other m 2021-08-23T21:38:08.20
IV.GUMA.HHE. ML:1.8 0.00039 0.2 AML other m 2021-08-23T21:38:06.68
IV.MTRA.EHN. ML:1.9 0.0005628092 0.3456 AML other m 2021-08-23T21:38:06.94
IV.CSP1.EHN. ML:1.8 0.00036278334999999994 0.1792 AML other m 2021-08-23T21:38:06.37
IV.FDMO.HHN. ML:1.5 0.00027400000000000005 0.3 AML other m 2021-08-23T21:38:07.64
IV.CESI.HHE. ML:1.5 0.00016199999999999998 0.4 AML other m 2021-08-23T21:38:07.84
IV.CESI.HHN. ML:1.5 0.0001915 0.2 AML other m 2021-08-23T21:38:07.80
IV.MTRA.EHE. ML:1.8 0.000515733 0.3072 AML other m 2021-08-23T21:38:07.72
IV.CSP1.EHE. ML:1.7 0.00032499999999999993 0.32 AML other m 2021-08-23T21:38:09.83
IV.GUMA.HNE. ML:1.6 0.00028411375 0.3712 AML other m 2021-08-23T21:38:09.86
IV.GUMA.HHN. ML:1.7 0.00035250000000000006 0.52 AML other m 2021-08-23T21:38:10.40
IV.GUMA.HNN. ML:1.6 0.00028570505 0.192 AML other m 2021-08-23T21:38:07.55
IV.MTRA.HNN. ML:1.9 0.00058986595 0.3456 AML other m 2021-08-23T21:38:06.94
IV.MTRA.HNE. ML:1.8 0.0005359283000000001 0.3328 AML other m 2021-08-23T21:38:07.20
IV.CESI.HNN. ML:1.5 0.00016461025000000002 0.192 AML other m 2021-08-23T21:38:07.71
IV.SMA1.EHN. ML:1.4 0.000130916125 0.384 AML other m 2021-08-23T21:38:14.64
IV.SMA1.EHE. ML:1.4 0.0001111792 0.4096 AML other m 2021-08-23T21:38:14.71
IV.GAVE.HNE. ML:1.6 0.0002072452 0.3584 AML other m 2021-08-23T21:38:12.92
IV.GAVE.EHN. ML:1.6 0.0001784892 0.2048 AML other m 2021-08-23T21:38:11.38
IV.GAVE.EHE. ML:1.7 0.0002166354 0.2176 AML other m 2021-08-23T21:38:12.94
IV.LNSS.HNE. ML:1.6 0.00016811728500000002 0.32 AML other m 2021-08-23T21:38:09.93
IV.LNSS.HHE. ML:1.6 0.00015790864999999998 0.3328 AML other m 2021-08-23T21:38:09.92
IV.LNSS.HHN. ML:1.7 0.00020539245 0.1792 AML other m 2021-08-23T21:38:09.97
IV.TERO.HHN. ML:1.6 0.000109140475 0.1024 AML other m 2021-08-23T21:38:12.41
IV.TERO.HNN. ML:1.6 0.00013382715000000002 0.1024 AML other m 2021-08-23T21:38:12.68
IV.TERO.HHE. ML:1.9 0.00023069444500000002 0.2048 AML other m 2021-08-23T21:38:12.51
IV.TERO.HNE. ML:1.7 0.00014282765 0.128 AML other m 2021-08-23T21:38:12.45
IV.ASSB.HHN. ML:1.3 0.00005478953 0.192 AML other m 2021-08-23T21:38:13.41
IV.ASSB.HHE. ML:1.2 0.00005102007 0.1024 AML other m 2021-08-23T21:38:15.64
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