Earthquake with magnitude of ML 1.3 on date 20-02-2021 and time 23:55:33 (Italy) in region 5 km W Arquata del Tronto (AP)

A magnitude ML 1.3 earthquake occured in region: 5 km W Arquata del Tronto (AP), on

  • 20-02-2021 22:55:33 (UTC)
  • 20-02-2021 23:55:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7740, 13.2400 at 11 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Arquata del Tronto AP 5 1178 1178
Accumoli RI 9 667 1845
Montegallo AP 11 523 2368
Norcia PG 12 4957 7325
Acquasanta Terme AP 14 2916 10241
Castelsantangelo sul Nera MC 15 281 10522
Montemonaco AP 16 604 11126
Amatrice RI 17 2657 13783
Cittareale RI 19 482 14265
Cascia PG 19 3217 17482

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
48 Km E of Foligno (57155 inhabitants)
49 Km N of L'Aquila (69753 inhabitants)
54 Km E of Terni (111501 inhabitants)
79 Km E of Perugia (166134 inhabitants)
80 Km W of Montesilvano (53738 inhabitants)
87 Km W of Pescara (121014 inhabitants)
89 Km NW of Chieti (51815 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
97 Km S of Ancona (100861 inhabitants)
97 Km NE of Tivoli (56533 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 1.3 2021-02-20
22:55:33
42.7742 13.2398 11 2021-07-12
16:55:15
Bollettino Sismico Italiano INGV 91397491
Reviewed
Rev100
ML 1.3 2021-02-20
22:55:33
42.7792 13.247 13 2021-02-20
23:00:27
Sala Sismica INGV-Roma 87341061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-20 22:55:33 ± 0.05
Latitude 42.7742 ± 0.0027
Longitude 13.2398 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91397491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 413
Semi-minor axis of confidence ellipse (meter) 131
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 76
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 57
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.10972
Epicentral distance of station farthest from the epicenter (degree) 0.56387
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 91397491
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-16 13:31:02

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 87341061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-20 23:00:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-02-20T22:55:53.97 0.6 undecidable manual S 350 62.5929 50 0.87 36
IV.CESI.HHZ. 2021-02-20T22:55:46.37 0.6 undecidable manual S 313 37.3293 50 0 48
IV.CSP1.EHZ. 2021-02-20T22:55:45.71 0.6 undecidable manual S 355 35.3424 50 -0.12 48
IV.GUMA.HHZ. 2021-02-20T22:55:45.72 0.6 undecidable manual S 14 32.9448 50 0.54 43
IV.TERO.HHZ. 2021-02-20T22:55:45.08 0.6 undecidable manual S 119 34.1436 50 -0.41 45
IV.FDMO.HHZ. 2021-02-20T22:55:44.64 0.3 undecidable manual S 337 31.6461 50 -0.19 71
IV.GAVE.EHZ. 2021-02-20T22:55:44.40 0.6 undecidable manual S 252 29.5482 50 0.11 48
IV.CAMP.HHZ. 2021-02-20T22:55:44.19 0.6 undecidable manual S 152 29.8479 50 -0.17 48
IV.MF5.EHZ. 2021-02-20T22:55:44.99 0.6 undecidable manual S 37 29.6481 50 0.68 41
IV.RM33.EHZ. 2021-02-20T22:55:44.41 0.6 undecidable manual S 184 29.4483 50 0.14 48
IV.EL6.EHZ. 2021-02-20T22:55:44.76 0.3 undecidable manual P 350 62.5929 50 -0.23 66
IV.LNSS.HHZ. 2021-02-20T22:55:43.39 0.6 undecidable manual S 221 25.0527 50 0.32 46
IV.MNTT.EHZ. 2021-02-20T22:55:42.72 0.3 undecidable manual P 42 43.0236 50 0.74 59
IV.SMA1.EHZ. 2021-02-20T22:55:41.12 0.6 undecidable manual S 154 17.7711 50 -0.01 50
IV.T1299.HNN. 2021-02-20T22:55:41.02 0.3 undecidable manual S 167 15.873 125 0.4 69
IV.MF5.EHZ. 2021-02-20T22:55:40.07 0.1 undecidable manual P 37 29.6481 50 0.15 95
IV.CESI.HHZ. 2021-02-20T22:55:40.87 0.1 undecidable manual P 313 37.3293 50 -0.24 92
IV.TERO.HHZ. 2021-02-20T22:55:40.30 0.1 undecidable manual P 119 34.1436 50 -0.3 92
IV.MMO1.EHN. 2021-02-20T22:55:40.35 0.3 undecidable manual S 27 15.5733 125 -0.18 73
IV.CSP1.EHZ. 2021-02-20T22:55:40.50 0.1 negative manual P 355 35.3424 50 -0.29 92
IV.GUMA.HHZ. 2021-02-20T22:55:40.48 0.1 undecidable manual P 14 32.9448 50 0.06 97
IV.MC2.EHZ. 2021-02-20T22:55:40.68 0.6 undecidable manual S 345 15.7731 125 0.09 49
IV.CAMP.HHZ. 2021-02-20T22:55:39.69 0.3 undecidable manual P 152 29.8479 50 -0.25 70
IV.MTRA.EHE. 2021-02-20T22:55:39.69 0.3 undecidable manual S 99 12.876 130 -0.11 74
IV.RM33.EHZ. 2021-02-20T22:55:39.84 0.1 undecidable manual P 184 29.4483 50 -0.05 97
IV.FDMO.HHZ. 2021-02-20T22:55:39.87 0.1 undecidable manual P 337 31.6461 50 -0.35 91
IV.NRCA.HHZ. 2021-02-20T22:55:39.61 0.6 undecidable manual S 303 12.1767 132 0.01 51
IV.LNSS.HHZ. 2021-02-20T22:55:39.21 0.1 undecidable manual P 221 25.0527 50 0.01 99
IV.GAVE.EHZ. 2021-02-20T22:55:39.84 0.1 undecidable manual P 252 29.5482 50 -0.06 97
IV.SMA1.EHZ. 2021-02-20T22:55:38.09 0.1 positive manual P 154 17.7711 50 0.02 100
IV.NRCA.HHZ. 2021-02-20T22:55:37.28 0.1 negative manual P 303 12.1767 132 0.08 100
IV.T1299.HNN. 2021-02-20T22:55:37.98 0.1 undecidable manual P 167 15.873 125 0.19 97
IV.MC2.EHZ. 2021-02-20T22:55:37.73 0.1 undecidable manual P 345 15.7731 125 -0.04 100
IV.MTRA.EHE. 2021-02-20T22:55:37.30 0.3 undecidable manual P 99 12.876 130 -0.01 76
IV.MMO1.EHN. 2021-02-20T22:55:37.62 0.1 undecidable manual P 27 15.5733 125 -0.12 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.8 0.000682 0.16 AML other m 2021-02-20T22:55:39.77
IV.NRCA.HHE. ML:1.9 0.0008959999999999999 1.36 AML other m 2021-02-20T22:55:40.82
IV.SMA1.EHE. ML:1.3 0.00015250000000000002 0.4 AML other m 2021-02-20T22:55:41.44
IV.SMA1.EHN. ML:1.4 0.0002125 0.2 AML other m 2021-02-20T22:55:41.23
IV.LNSS.HHN. ML:1.3 0.0001235 0.5 AML other m 2021-02-20T22:55:43.63
IV.LNSS.HHE. ML:1.3 0.00011649999999999999 0.12 AML other m 2021-02-20T22:55:43.67
IV.CAMP.HHN. ML:0.9 0.000037199999999999996 0.3 AML other m 2021-02-20T22:55:44.55
IV.RM33.EHN. ML:1.5 0.0001685 0.26 AML other m 2021-02-20T22:55:44.69
IV.RM33.EHE. ML:1.5 0.000151 0.58 AML other m 2021-02-20T22:55:44.52
IV.FDMO.HHN. ML:0.8 0.00003225 1.82 AML other m 2021-02-20T22:55:45.01
IV.CAMP.HHE. ML:1.1 0.0000536 0.56 AML other m 2021-02-20T22:55:45.58
IV.TERO.HHN. ML:1.2 0.00006695000000000001 0.14 AML other m 2021-02-20T22:55:45.57
IV.TERO.HHE. ML:1.1 0.00005715 1.14 AML other m 2021-02-20T22:55:45.67
IV.GUMA.HHE. ML:1.6 0.000183 1.74 AML other m 2021-02-20T22:55:45.05
IV.GUMA.HHN. ML:1.8 0.00027 1.74 AML other m 2021-02-20T22:55:46.08
IV.CESI.HHN. ML:1.2 0.000052699999999999993 0.26 AML other m 2021-02-20T22:55:46.79
IV.CESI.HHE. ML:1.0 0.000034200000000000005 0.2 AML other m 2021-02-20T22:55:47.20
IV.FDMO.HHE. ML:0.8 0.000030200000000000002 0.12 AML other m 2021-02-20T22:55:47.50
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