Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 25-10-2020 and time 06:37:29 (Italy) in region 4 km W Amatrice (RI)

A magnitude ML 0.9 earthquake occured in region: 4 km W Amatrice (RI), on

  • 25-10-2020 05:37:29 (UTC)
  • 25-10-2020 06:37:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6360, 13.2410 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.

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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 4 2657 2657
Accumoli RI 7 667 3324
Cittareale RI 7 482 3806
Montereale AQ 12 2581 6387
Capitignano AQ 14 665 7052
Campotosto AQ 14 542 7594
Arquata del Tronto AP 16 1178 8772
Borbona RI 16 617 9389
Posta RI 17 694 10083
Cagnano Amiterno AQ 20 1369 11452

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km NW of L'Aquila (69753 inhabitants)
38 Km W of Teramo (54892 inhabitants)
49 Km E of Terni (111501 inhabitants)
56 Km SE of Foligno (57155 inhabitants)
76 Km W of Montesilvano (53738 inhabitants)
82 Km W of Pescara (121014 inhabitants)
82 Km NE of Guidonia Montecelio (88673 inhabitants)
82 Km W of Chieti (51815 inhabitants)
83 Km NE of Tivoli (56533 inhabitants)
87 Km SE of Perugia (166134 inhabitants)
96 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 0.9 2020-10-25
05:37:29		 42.6363 13.2412 11 2021-02-26
14:56:20		 Bollettino Sismico Italiano INGV 87450861
Reviewed
Rev100 		ML 1.1 2020-10-25
05:37:28		 42.6468 13.311 17 2020-10-25
06:27:08		 Sala Sismica INGV-Roma 84108621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-25 05:37:29 ± 0.05
Latitude 42.6363 ± 0.0036
Longitude 13.2412 ± 0.0049
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87450861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 420
Semi-minor axis of confidence ellipse (meter) 360
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 235
Circular confidence region, given by single value of horizontal uncertainty (meter) 420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.21764
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 87450861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-24 12:52:30

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 9
Type of magnitude ML
Reference to an origin 84108621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-25 06:27:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2020-10-25T05:37:51.52 3.0 undecidable manual S -0.07 0
IV.NRCA.HHZ. 2020-10-25T05:37:38.03 0.6 undecidable manual S 335 24.1536 90 -0.15 48
IV.MNTT.EHZ. 2020-10-25T05:37:37.41 3.0 undecidable manual P -0.4 0
IV.MTRA.EHE. 2020-10-25T05:37:36.41 0.6 undecidable manual S 43 18.3705 90 -0.22 48
IV.LNSS.HHN. 2020-10-25T05:37:36.07 0.6 undecidable manual S 257 16.7721 90 -0.14 49
IV.CAMP.HHE. 2020-10-25T05:37:36.15 0.6 undecidable manual S 129 17.6712 90 -0.29 47
IV.RM33.EHZ. 2020-10-25T05:37:35.36 0.6 undecidable manual S 189 14.2746 91 -0.18 49
IV.NRCA.HHZ. 2020-10-25T05:37:34.41 0.1 undecidable manual P 335 24.1536 90 0 99
IV.LNSS.HHN. 2020-10-25T05:37:33.33 0.1 undecidable manual P 257 16.7721 90 0.06 99
IV.SMA1.EHZ. 2020-10-25T05:37:33.97 0.6 undecidable manual S 95 7.6812 132 0.02 51
IV.CAMP.HHE. 2020-10-25T05:37:33.44 0.3 undecidable manual P 129 17.6712 90 0.04 75
IV.T1299.HNE. 2020-10-25T05:37:33.10 0.6 undecidable manual S 94 3.3966 158 -0.18 50
IV.MTRA.EHE. 2020-10-25T05:37:33.53 0.3 undecidable manual P 43 18.3705 90 0.01 75
IV.SMA1.EHZ. 2020-10-25T05:37:32.25 0.1 undecidable manual P 95 7.6812 132 0.28 96
IV.RM33.EHZ. 2020-10-25T05:37:32.93 0.3 undecidable manual P 189 14.2746 91 0.05 75
IV.T1299.HNE. 2020-10-25T05:37:31.72 0.1 undecidable manual P 94 3.3966 158 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.6 0.0005074999999999999 0.34 AML other m 2020-10-25T05:37:34.28
IV.SMA1.EHN. ML:1.1 0.000183 0.88 AML other m 2020-10-25T05:37:34.41
IV.RM33.EHN. ML:0.7 0.000046450000000000004 0.86 AML other m 2020-10-25T05:37:35.75
IV.RM33.EHE. ML:0.7 0.0000455 1.48 AML other m 2020-10-25T05:37:36.81
IV.NRCA.HHE. ML:1.0 0.00006505 0.14 AML other m 2020-10-25T05:37:38.22
IV.NRCA.HHN. ML:0.7 0.000028049999999999997 0.38 AML other m 2020-10-25T05:37:38.40
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