Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 05-02-2021 and time 10:23:13 (Italy) in region 6 km W Arquata del Tronto (AP)

A magnitude ML 1.1 earthquake occured in region: 6 km W Arquata del Tronto (AP), on

  • 05-02-2021 09:23:13 (UTC)
  • 05-02-2021 10:23:13 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7870, 13.2310 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
Arquata del Tronto AP 6 1178 1178
Accumoli RI 10 667 1845
Montegallo AP 10 523 2368
Norcia PG 11 4957 7325
Castelsantangelo sul Nera MC 14 281 7606
Acquasanta Terme AP 15 2916 10522
Montemonaco AP 15 604 11126
Amatrice RI 18 2657 13783
Preci PG 19 724 14507
Ussita MC 19 444 14951
Cascia PG 19 3217 18168
Montefortino FM 20 1178 19346
Cittareale RI 20 482 19828
Visso MC 20 1107 20935

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
50 Km N of L'Aquila (69753 inhabitants)
54 Km E of Terni (111501 inhabitants)
77 Km E of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
88 Km W of Pescara (121014 inhabitants)
91 Km NW of Chieti (51815 inhabitants)
95 Km S of Ancona (100861 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 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
Reviewed
Rev100 		ML 1.1 2021-02-05
09:23:13		 42.7872 13.2313 10 2021-02-05
09:32:02		 Sala Sismica INGV-Roma 86851241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-05 09:23:13 ± 0.09
Latitude 42.7872 ± 0.0045
Longitude 13.2313 ± 0.0086
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86851241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 717
Semi-minor axis of confidence ellipse (meter) 240
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 18
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) 0.32376
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 86851241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-05 09:32:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.QLNO.HHZ. 2021-02-05T09:25:10.70 3.0 undecidable manual Sg 15.11 0
IV.SARZ.HNZ. 2021-02-05T09:25:07.26 3.0 undecidable manual Sg 13.73 0
IV.IFIL.HHZ. 2021-02-05T09:25:06.53 3.0 undecidable manual Sn -2.09 0
IV.FREG.EHZ. 2021-02-05T09:24:40.48 3.0 undecidable manual Sn -5.43 0
MN.BNI.HHZ. 2021-02-05T09:24:36.78 3.0 negative manual Pn 8.29 0
IV.PIPA.HHZ. 2021-02-05T09:24:12.88 3.0 undecidable manual Pn -4.18 0
IV.IMOL.HNZ. 2021-02-05T09:24:11.33 3.0 undecidable manual Sg 1 0
IV.NDIM.HNZ. 2021-02-05T09:23:56.95 3.0 positive manual Pg 2.39 0
IV.BRSN.EHZ. 2021-02-05T09:23:39.00 3.0 positive manual Pn -2.63 0
IV.LPEL.HHZ. 2021-02-05T09:23:35.28 3.0 positive manual P 2.61 0
IV.EL6.EHZ. 2021-02-05T09:23:34.52 3.0 undecidable manual S -1.06 0
IV.CPGN.EHZ. 2021-02-05T09:23:29.88 3.0 undecidable manual P -4.72 0
IV.CSP1.EHZ. 2021-02-05T09:23:25.22 0.3 undecidable manual S 356 33.8439 50 -0.21 70
IV.MNTT.EHZ. 2021-02-05T09:23:25.07 3.0 positive manual P 1.86 0
IV.TERO.HHZ. 2021-02-05T09:23:25.58 0.6 undecidable manual S 121 35.4423 50 -0.26 46
IV.CESI.HHZ. 2021-02-05T09:23:25.82 0.1 undecidable manual S 312 35.9418 50 -0.15 94
IV.MF5.EHZ. 2021-02-05T09:23:24.71 0.3 undecidable manual S 40 28.9488 50 0.58 64
IV.RM33.EHZ. 2021-02-05T09:23:24.91 0.6 undecidable manual S 183 30.8469 50 0.28 46
IV.SMA1.EHZ. 2021-02-05T09:23:21.15 0.3 undecidable manual S 154 19.3695 117 -0.04 74
IV.MF5.EHZ. 2021-02-05T09:23:20.08 0.3 undecidable manual P 40 28.9488 50 0.38 68
IV.CESI.HHZ. 2021-02-05T09:23:20.56 0.3 undecidable manual P 312 35.9418 50 -0.21 70
IV.RM33.EHZ. 2021-02-05T09:23:20.05 0.6 undecidable manual P 183 30.8469 50 0.06 48
IV.CSP1.EHZ. 2021-02-05T09:23:20.22 0.3 undecidable manual P 356 33.8439 50 -0.24 70
IV.TERO.HHZ. 2021-02-05T09:23:20.56 0.3 undecidable manual P 121 35.4423 50 -0.14 71
IV.MC2.EHZ. 2021-02-05T09:23:20.16 0.1 undecidable manual S 346 14.1747 125 0.5 91
IV.MTRA.EHZ. 2021-02-05T09:23:19.45 0.3 undecidable manual S 104 13.875 125 -0.12 74
IV.MMO1.EHZ. 2021-02-05T09:23:19.34 0.3 undecidable manual S 32 14.6742 124 -0.46 69
IV.SMA1.EHZ. 2021-02-05T09:23:18.16 0.3 undecidable manual P 154 19.3695 117 0.15 73
IV.MC2.EHZ. 2021-02-05T09:23:17.09 0.1 undecidable manual P 346 14.1747 125 -0.04 100
IV.MTRA.EHZ. 2021-02-05T09:23:17.20 0.3 undecidable manual P 104 13.875 125 0.13 74
IV.MMO1.EHZ. 2021-02-05T09:23:16.98 0.3 undecidable manual P 32 14.6742 124 -0.22 72
IV.ARRO.EHZ. 2021-02-05T09:23:15.69 3.0 undecidable manual S -2.38 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:1.4 0.0002805 0.12 AML other m 2021-02-05T09:23:20.64
IV.MTRA.EHN. ML:1.2 0.000169 1.7 AML other m 2021-02-05T09:23:20.00
IV.TERO.HHE. ML:0.8 0.000026249999999999998 1.46 AML other m 2021-02-05T09:23:25.94
IV.TERO.HHN. ML:0.9 0.00003535 1.46 AML other m 2021-02-05T09:23:26.76
IV.SMA1.EHN. ML:0.9 0.000054800000000000004 0.56 AML other m 2021-02-05T09:23:26.39
IV.SMA1.EHE. ML:1.0 0.0000693 1.4 AML other m 2021-02-05T09:23:27.00
IV.MNTT.EHN. ML:2.2 0.000516 0.08 AML other m 2021-02-05T09:23:34.57
IV.MNTT.EHE. ML:2.2 0.000592 0.08 AML other m 2021-02-05T09:23:39.45
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