Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 22-10-2021 and time 19:20:38 (UTC) in region 4 km NE Castelsantangelo sul Nera (MC)

A magnitude ML 0.9 earthquake occured in region: 4 km NE Castelsantangelo sul Nera (MC), on

  • 22-10-2021 19:20:38 (UTC)
  • 22-10-2021 21:20:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9240, 13.1850 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Ussita MC 4 444 725
Visso MC 8 1107 1832
Bolognola MC 9 142 1974
Montemonaco AP 12 604 2578
Acquacanina MC 12 121 2699
Preci PG 13 724 3423
Fiastra MC 13 559 3982
Montefortino FM 13 1178 5160
Fiordimonte MC 15 202 5362
Montegallo AP 15 523 5885
Amandola FM 15 3629 9514
Sarnano MC 16 3264 12778
Norcia PG 16 4957 17735
Monte Cavallo MC 17 145 17880
Pieve Torina MC 17 1458 19338
Pievebovigliana MC 18 866 20204
Arquata del Tronto AP 19 1178 21382
Comunanza AP 19 3166 24548

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Foligno (57155 inhabitants)
52 Km NW of Teramo (54892 inhabitants)
60 Km NE of Terni (111501 inhabitants)
66 Km N of L'Aquila (69753 inhabitants)
68 Km E of Perugia (166134 inhabitants)
82 Km SW of Ancona (100861 inhabitants)
91 Km NW of Montesilvano (53738 inhabitants)
98 Km NW 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
Reviewed
Rev100 		ML 0.9 2021-10-22
19:20:38		 42.9238 13.1848 11 2021-10-22
19:24:24		 Sala Sismica INGV-Roma 96885511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-22 19:20:38 ± 0.06
Latitude 42.9238 ± 0.0036
Longitude 13.1848 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96885511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 384
Semi-minor axis of confidence ellipse (meter) 335
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 222
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 82
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.01259
Epicentral distance of station farthest from the epicenter (degree) 0.24551
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 96885511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-22 19:24:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2021-10-22T19:20:48.59 0.6 undecidable manual S 321 27.2505 50 0.05 48
IV.MF5.EHZ. 2021-10-22T19:20:47.87 0.6 undecidable manual S 72 23.4543 50 0.34 46
IV.CESI.HHZ. 2021-10-22T19:20:47.76 0.6 undecidable manual S 292 24.4533 50 -0.05 49
IV.CSP1.EHZ. 2021-10-22T19:20:46.04 0.3 undecidable manual S 5 18.6702 119 -0.08 73
IV.MML1.EHZ. 2021-10-22T19:20:44.38 0.6 undecidable manual P 321 27.2505 50 0.01 49
IV.FDMO.HHZ. 2021-10-22T19:20:44.92 0.3 undecidable manual S 328 14.7741 125 -0.05 74
IV.CESI.HHZ. 2021-10-22T19:20:43.93 0.1 positive manual P 292 24.4533 50 -0.02 98
IV.MMO1.EHZ. 2021-10-22T19:20:43.88 0.6 undecidable manual S 103 11.877 131 -0.28 47
IV.CSP1.EHZ. 2021-10-22T19:20:43.00 0.1 undecidable manual P 5 18.6702 119 0.03 99
IV.NRCA.HHZ. 2021-10-22T19:20:43.95 0.3 undecidable manual S 210 11.5773 132 -0.14 73
IV.MF5.EHZ. 2021-10-22T19:20:43.14 1.0 undecidable manual P 72 23.4543 50 -0.64 21
IV.MC2.EHZ. 2021-10-22T19:20:42.74 0.6 undecidable manual S 166 1.3986 172 0.4 47
IV.FDMO.HHZ. 2021-10-22T19:20:42.35 1.0 undecidable manual P 328 14.7741 125 0.04 25
IV.NRCA.HHZ. 2021-10-22T19:20:41.87 0.1 negative manual P 210 11.5773 132 0.06 99
IV.MC2.EHZ. 2021-10-22T19:20:41.16 1.0 negative manual P 166 1.3986 172 0.36 24
IV.MMO1.EHZ. 2021-10-22T19:20:41.82 0.1 undecidable manual P 103 11.877 131 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.0 0.00011649999999999999 1.44 AML other m 2021-10-22T19:20:44.10
IV.NRCA.HHN. ML:1.0 0.000112 0.12 AML other m 2021-10-22T19:20:44.76
IV.FDMO.HHN. ML:0.9 0.0000713 0.22 AML other m 2021-10-22T19:20:45.29
IV.FDMO.HHE. ML:0.7 0.0000439 0.26 AML other m 2021-10-22T19:20:45.33
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