Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 20-02-2021 and time 00:44:46 (UTC) in region 3 km SE Montefortino (FM)

A magnitude ML 1.2 earthquake occured in region: 3 km SE Montefortino (FM), on

  • 20-02-2021 00:44:46 (UTC)
  • 20-02-2021 01:44:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9180, 13.3600 at 18 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
Montefortino FM 3 1178 1178
Montemonaco AP 3 604 1782
Comunanza AP 6 3166 4948
Amandola FM 7 3629 8577
Palmiano AP 8 196 8773
Montegallo AP 9 523 9296
Montefalcone Appennino FM 11 424 9720
Roccafluvione AP 11 2010 11730
Venarotta AP 12 2066 13796
Force AP 12 1354 15150
Smerillo FM 12 365 15515
Bolognola MC 14 142 15657
Sarnano MC 14 3264 18921
Monte San Martino MC 14 765 19686
Santa Vittoria in Matenano FM 16 1330 21016
Penna San Giovanni MC 16 1108 22124
Gualdo MC 17 815 22939
Rotella AP 17 906 23845
Arquata del Tronto AP 17 1178 25023
Castelsantangelo sul Nera MC 17 281 25304
Acquasanta Terme AP 17 2916 28220
Montelparo FM 18 778 28998
Ussita MC 18 444 29442
Ascoli Piceno AP 19 49407 78849
Montedinove AP 19 488 79337
Acquacanina MC 20 121 79458
Monteleone di Fermo FM 20 395 79853

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km NW of Teramo (54892 inhabitants)
54 Km E of Foligno (57155 inhabitants)
63 Km N of L'Aquila (69753 inhabitants)
70 Km NE of Terni (111501 inhabitants)
79 Km NW of Montesilvano (53738 inhabitants)
79 Km S of Ancona (100861 inhabitants)
82 Km E of Perugia (166134 inhabitants)
86 Km NW of Pescara (121014 inhabitants)
91 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 1.2 2021-02-20
00:44:46		 42.9183 13.3605 18 2021-07-12
16:55:15		 Bollettino Sismico Italiano INGV 91387781
Reviewed
Rev100 		ML 1.3 2021-02-20
00:44:45		 42.9177 13.3672 20 2021-02-20
00:57:08		 Sala Sismica INGV-Roma 87310071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-20 00:44:46 ± 0.11
Latitude 42.9183 ± 0.0036
Longitude 13.3605 ± 0.0061
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91387781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 469
Semi-minor axis of confidence ellipse (meter) 260
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 255
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.03148
Epicentral distance of station farthest from the epicenter (degree) 0.34534
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:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 91387781
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-16 10:25:21

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 87310071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-20 00:57:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.HNE. 2021-02-20T00:44:59.38 0.3 undecidable manual S 305 38.2284 105 0.3 68
IV.TERO.HHZ. 2021-02-20T00:44:59.09 0.6 undecidable manual S 149 38.3283 105 0 48
IV.CESI.HHZ. 2021-02-20T00:44:59.40 0.6 undecidable manual S 285 38.2284 105 0.33 45
IV.SMA1.EHZ. 2021-02-20T00:44:57.76 0.6 undecidable manual S 184 32.0457 109 0.28 46
IV.MNTT.EHZ. 2021-02-20T00:44:56.60 0.6 undecidable manual S 50 24.8529 116 0.87 39
IV.NRCA.HHZ. 2021-02-20T00:44:55.37 0.6 undecidable manual S 245 22.1556 120 0.29 47
IV.FDMO.HHN. 2021-02-20T00:44:55.82 0.3 undecidable manual S 301 25.752 115 -0.12 73
IV.MTRA.EHZ. 2021-02-20T00:44:54.25 0.6 undecidable manual S 171 18.1707 127 0.05 50
IV.MC2.EHZ. 2021-02-20T00:44:53.75 0.6 undecidable manual S 267 13.9749 136 0.39 47
IV.CESI.HHZ. 2021-02-20T00:44:53.75 0.3 undecidable manual P 285 38.2284 105 0.14 71
IV.MML1.HNE. 2021-02-20T00:44:53.36 0.3 undecidable manual P 305 38.2284 105 -0.25 69
IV.GUMA.HNN. 2021-02-20T00:44:53.86 0.6 undecidable manual S 353 16.1727 131 0.08 50
IV.TERO.HHZ. 2021-02-20T00:44:53.68 0.3 undecidable manual P 149 38.3283 105 0.06 72
IV.SMA1.EHZ. 2021-02-20T00:44:52.54 0.1 undecidable manual P 184 32.0457 109 -0.15 95
IV.MF5.EHZ. 2021-02-20T00:44:52.99 0.6 undecidable manual S 46 11.1777 143 0.12 50
IV.MMO1.EHN. 2021-02-20T00:44:51.88 0.3 undecidable manual S 232 3.4965 167 -0.12 75
IV.MNTT.EHZ. 2021-02-20T00:44:51.70 0.3 undecidable manual P 50 24.8529 116 0.02 74
IV.NRCA.HHZ. 2021-02-20T00:44:51.25 0.1 negative manual P 245 22.1556 120 -0.06 99
IV.FDMO.HHN. 2021-02-20T00:44:51.50 0.1 undecidable manual P 301 25.752 115 -0.3 93
IV.GUMA.HNN. 2021-02-20T00:44:50.36 0.1 undecidable manual P 353 16.1727 131 -0.19 97
IV.MC2.EHZ. 2021-02-20T00:44:50.31 0.3 undecidable manual P 267 13.9749 136 0 76
IV.MTRA.EHZ. 2021-02-20T00:44:50.70 0.3 undecidable manual P 171 18.1707 127 -0.1 74
IV.MF5.EHZ. 2021-02-20T00:44:49.95 0.1 positive manual P 46 11.1777 143 -0.08 100
IV.MMO1.EHN. 2021-02-20T00:44:49.31 0.1 undecidable manual P 232 3.4965 167 -0.22 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHN. ML:1.6 0.000263 0.18 AML other m 2021-02-20T00:44:54.41
IV.MTRA.EHE. ML:1.4 0.0001475 0.46 AML other m 2021-02-20T00:44:54.64
IV.NRCA.HHN. ML:1.6 0.000222 0.12 AML other m 2021-02-20T00:44:55.58
IV.NRCA.HHE. ML:1.4 0.0001465 0.14 AML other m 2021-02-20T00:44:55.53
IV.SMA1.EHN. ML:0.9 0.00003095 0.5 AML other m 2021-02-20T00:44:58.02
IV.SMA1.EHE. ML:1.2 0.00005830000000000001 0.32 AML other m 2021-02-20T00:44:58.05
IV.TERO.HHE. ML:0.5 0.0000113 0.62 AML other m 2021-02-20T00:45:00.56
IV.TERO.HHN. ML:0.7 0.000016049999999999997 0.64 AML other m 2021-02-20T00:45:00.53
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