Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 25-08-2020 and time 06:55:20 (UTC) in region 2 km SW Amatrice (RI)

A magnitude ML 0.4 earthquake occured in region: 2 km SW Amatrice (RI), on

  • 25-08-2020 06:55:20 (UTC)
  • 25-08-2020 08:55:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6190, 13.2680 at 13 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
Amatrice RI 2 2657 2657
Accumoli RI 9 667 3324
Cittareale RI 9 482 3806
Montereale AQ 11 2581 6387
Campotosto AQ 11 542 6929
Capitignano AQ 11 665 7594
Borbona RI 16 617 8211
Arquata del Tronto AP 17 1178 9389
Posta RI 18 694 10083
Cagnano Amiterno AQ 18 1369 11452
Barete AQ 19 737 12189
Crognaleto TE 19 1297 13486
Cortino TE 20 656 14142

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of L'Aquila (69753 inhabitants)
36 Km W of Teramo (54892 inhabitants)
51 Km E of Terni (111501 inhabitants)
59 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
79 Km W of Pescara (121014 inhabitants)
80 Km W of Chieti (51815 inhabitants)
82 Km NE of Guidonia Montecelio (88673 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
90 Km SE of Perugia (166134 inhabitants)
98 Km E of Viterbo (67173 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 0.4 2020-08-25
06:55:20		 42.6187 13.2683 13 2020-11-19
12:36:59		 Bollettino Sismico Italiano INGV 82562401
Reviewed
Rev100 		Md 1.5 2020-08-25
06:55:21		 42.611 13.3042 3 2020-08-25
07:03:28		 Sala Sismica INGV-Roma 82307071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-25 06:55:20 ± 0.15
Latitude 42.6187 ± 0.0063
Longitude 13.2683 ± 0.0086
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 82562401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 686
Semi-minor axis of confidence ellipse (meter) 188
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 316
Circular confidence region, given by single value of horizontal uncertainty (meter) 690.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
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) 0.01889
Epicentral distance of station farthest from the epicenter (degree) 0.43977
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 82562401
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-02 14:12:39

Md:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 3
Type of magnitude Md
Reference to an origin 82307071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-25 07:03:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NRCA.HHZ. 2020-08-25T06:55:30.30 0.3 undecidable manual S 332 26.9508 99 -0.28 70
IV.TERO.HHZ. 2020-08-25T06:55:30.33 0.3 undecidable manual S 89 27.3504 98 -0.37 70
IV.OFFI.HHZ. 2020-08-25T06:55:29.59 1.0 undecidable manual P 44 48.8178 93 -0.25 23
IV.MMO1.EHZ. 2020-08-25T06:55:28.15 1.0 undecidable manual P 9 31.5462 97 0.97 18
IV.MTRA.EHZ. 2020-08-25T06:55:28.16 0.3 undecidable manual S 34 18.5703 108 -0.23 72
IV.CAMP.HHE. 2020-08-25T06:55:27.24 1.0 undecidable manual S 129 14.6742 117 -0.2 25
IV.TERO.HHZ. 2020-08-25T06:55:26.65 0.1 undecidable manual P 89 27.3504 98 0.1 98
IV.RM33.EHZ. 2020-08-25T06:55:26.73 0.3 undecidable manual S 200 12.9759 122 -0.29 72
IV.NRCA.HHZ. 2020-08-25T06:55:26.54 0.3 undecidable manual P 332 26.9508 99 0.06 75
IV.SMA1.EHN. 2020-08-25T06:55:25.76 0.3 undecidable manual S 76 5.5944 151 0.09 77
IV.MTRA.EHZ. 2020-08-25T06:55:25.31 0.3 undecidable manual P 34 18.5703 108 0.09 75
IV.RM33.EHZ. 2020-08-25T06:55:24.55 0.1 undecidable manual P 200 12.9759 122 0.12 100
IV.CAMP.HHE. 2020-08-25T06:55:24.46 1.0 undecidable manual P 129 14.6742 117 -0.21 25
IV.SMA1.EHN. 2020-08-25T06:55:24.00 0.1 undecidable manual P 76 5.5944 151 0.35 97
IV.T1299.HNN. 2020-08-25T06:55:23.58 0.3 undecidable manual P 33 2.0979 169 0.12 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHE. ML:0.5 0.00003007568 0.0992 AML other m 2020-08-25T06:55:27.27
IV.RM33.EHN. ML:0.3 0.000021553189999999998 0.1216 AML other m 2020-08-25T06:55:26.92
IV.TERO.HHN. ML:0.6 0.0000196278065 0.0832 AML other m 2020-08-25T06:55:30.80
IV.TERO.HHE. ML:0.3 0.000012293987499999999 0.1184 AML other m 2020-08-25T06:55:31.52
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