Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 02-02-2021 and time 03:37:46 (Italy) in region 4 km SW Arquata del Tronto (AP)

A magnitude ML 1.2 earthquake occured in region: 4 km SW Arquata del Tronto (AP), on

  • 02-02-2021 02:37:46 (UTC)
  • 02-02-2021 03:37:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7550, 13.2610 at 11 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 4 1178 1178
Accumoli RI 7 667 1845
Montegallo AP 12 523 2368
Acquasanta Terme AP 12 2916 5284
Amatrice RI 14 2657 7941
Norcia PG 14 4957 12898
Montemonaco AP 17 604 13502
Cittareale RI 17 482 13984
Castelsantangelo sul Nera MC 18 281 14265
Valle Castellana TE 20 977 15242

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km W of Teramo (54892 inhabitants)
46 Km N of L'Aquila (69753 inhabitants)
51 Km E of Foligno (57155 inhabitants)
55 Km E of Terni (111501 inhabitants)
77 Km W of Montesilvano (53738 inhabitants)
81 Km E of Perugia (166134 inhabitants)
84 Km W of Pescara (121014 inhabitants)
87 Km NW of Chieti (51815 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
98 Km S of Ancona (100861 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 1.2 2021-02-02
02:37:46		 42.7547 13.2613 11 2021-02-02
02:45:07		 Sala Sismica INGV-Roma 86777131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-02 02:37:46 ± 0.09
Latitude 42.7547 ± 0.0045
Longitude 13.2613 ± 0.0073
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 86777131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 593
Semi-minor axis of confidence ellipse (meter) 411
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 57
Circular confidence region, given by single value of horizontal uncertainty (meter) 590.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 118
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.33904
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:1.2

Field Value
Value 1.2
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 86777131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-02 02:45:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-02-02T02:37:58.55 0.6 undecidable manual S 353 37.629 50 -0.08 48
IV.FDMO.HHZ. 2021-02-02T02:37:57.38 0.6 undecidable manual S 336 34.3434 50 -0.35 46
IV.MF5.EHZ. 2021-02-02T02:37:57.30 0.6 undecidable manual S 32 30.4473 50 0.59 43
IV.TERO.HHZ. 2021-02-02T02:37:56.48 0.6 undecidable manual S 118 31.5462 50 -0.51 44
IV.RM33.EHZ. 2021-02-02T02:37:56.09 0.6 undecidable manual S 188 27.5502 50 0.17 48
IV.CSP1.EHZ. 2021-02-02T02:37:53.22 0.6 negative manual P 353 37.629 50 -0.08 48
IV.NRCA.HHZ. 2021-02-02T02:37:52.21 0.6 undecidable manual S 306 14.874 125 -0.12 50
IV.TERO.HHZ. 2021-02-02T02:37:52.21 1.0 positive manual P 118 31.5462 50 -0.14 24
IV.MMO1.EHZ. 2021-02-02T02:37:52.76 0.6 undecidable manual S 18 16.872 122 -0.17 49
IV.FDMO.HHZ. 2021-02-02T02:37:52.69 1.0 negative manual P 336 34.3434 50 -0.09 24
IV.MF5.EHZ. 2021-02-02T02:37:52.82 1.0 negative manual P 32 30.4473 50 0.63 21
IV.MTRA.EHZ. 2021-02-02T02:37:51.18 0.6 undecidable manual S 89 10.9779 134 -0.12 50
IV.RM33.EHZ. 2021-02-02T02:37:51.78 0.6 negative manual P 188 27.5502 50 0.05 49
IV.MMO1.EHZ. 2021-02-02T02:37:50.01 0.6 undecidable manual P 18 16.872 122 0.01 51
IV.MTRA.EHZ. 2021-02-02T02:37:49.22 0.3 undecidable manual P 89 10.9779 134 0.16 75
IV.NRCA.HHZ. 2021-02-02T02:37:49.76 0.1 undecidable manual P 306 14.874 125 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.000177 0.08 AML other m 2021-02-02T02:37:52.27
IV.NRCA.HHN. ML:1.1 0.0001129 0.14 AML other m 2021-02-02T02:37:52.28
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