Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 25-08-2020 and time 12:07:25 (Italy) in region 2 km W Amatrice (RI)

A magnitude ML 1.1 earthquake occured in region: 2 km W Amatrice (RI), on

  • 25-08-2020 10:07:25 (UTC)
  • 25-08-2020 12:07:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6240, 13.2610 at 13 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
Amatrice RI 2 2657 2657
Accumoli RI 8 667 3324
Cittareale RI 8 482 3806
Montereale AQ 11 2581 6387
Campotosto AQ 12 542 6929
Capitignano AQ 12 665 7594
Borbona RI 16 617 8211
Arquata del Tronto AP 17 1178 9389
Posta RI 17 694 10083
Cagnano Amiterno AQ 18 1369 11452
Barete AQ 19 737 12189
Crognaleto TE 20 1297 13486

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of L'Aquila (69753 inhabitants)
37 Km W of Teramo (54892 inhabitants)
51 Km E of Terni (111501 inhabitants)
59 Km SE of Foligno (57155 inhabitants)
74 Km W of Montesilvano (53738 inhabitants)
80 Km W of Pescara (121014 inhabitants)
80 Km W of Chieti (51815 inhabitants)
82 Km NE of Guidonia Montecelio (88673 inhabitants)
83 Km NE of Tivoli (56533 inhabitants)
89 Km SE of Perugia (166134 inhabitants)
97 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
Reviewed
Rev100 		ML 1.1 2020-08-25
10:07:25		 42.6237 13.261 13 2020-08-25
10:11:16		 Sala Sismica INGV-Roma 82311471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-25 10:07:25 ± 0.08
Latitude 42.6237 ± 0.0036
Longitude 13.2610 ± 0.0049
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 82311471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 435
Semi-minor axis of confidence ellipse (meter) 228
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 331
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.27789
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 82311471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-25 10:11:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2020-08-25T10:07:40.78 3.0 undecidable manual P -0.21 0
IV.SAP2.EHZ. 2020-08-25T10:07:40.04 3.0 undecidable manual S -3.69 0
IV.GAVE.EHZ. 2020-08-25T10:07:36.39 0.1 undecidable manual S 284 30.8469 95 -0.03 95
IV.TERO.HHZ. 2020-08-25T10:07:35.53 0.1 undecidable manual S 90 27.9498 96 -0.12 94
IV.NRCA.HHZ. 2020-08-25T10:07:35.04 0.1 undecidable manual S 333 26.1516 96 -0.13 93
IV.MTRA.EHZ. 2020-08-25T10:07:32.96 0.1 undecidable manual S 37 18.4704 104 -0.17 94
IV.NRCA.HHZ. 2020-08-25T10:07:31.35 0.3 undecidable manual P 333 26.1516 96 0.18 71
IV.RM33.EHZ. 2020-08-25T10:07:31.60 0.1 undecidable manual S 197 13.2756 117 -0.24 96
IV.TERO.HHZ. 2020-08-25T10:07:31.65 0.6 undecidable manual P 90 27.9498 96 0.2 47
IV.GAVE.EHZ. 2020-08-25T10:07:31.97 1.0 negative manual P 284 30.8469 95 0.08 24
IV.SMA1.EHZ. 2020-08-25T10:07:30.39 0.1 undecidable manual S 83 6.0939 147 -0.02 100
IV.MTRA.EHZ. 2020-08-25T10:07:30.12 0.3 undecidable manual P 37 18.4704 104 0.13 72
IV.RM33.EHZ. 2020-08-25T10:07:29.38 0.1 positive manual P 197 13.2756 117 0.13 96
IV.SMA1.EHZ. 2020-08-25T10:07:28.70 0.3 negative manual P 83 6.0939 147 0.28 71
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.7 0.000682 0.26 AML other m 2020-08-25T10:07:30.67
IV.SMA1.EHN. ML:1.3 0.000254 0.48 AML other m 2020-08-25T10:07:30.79
IV.RM33.EHN. ML:1.1 0.0001185 1.9 AML other m 2020-08-25T10:07:32.99
IV.RM33.EHE. ML:1.0 0.00009559999999999999 1.48 AML other m 2020-08-25T10:07:32.10
IV.MTRA.EHN. ML:1.2 0.000117 0.44 AML other m 2020-08-25T10:07:33.43
IV.MTRA.EHE. ML:1.3 0.00014700000000000002 0.18 AML other m 2020-08-25T10:07:33.90
IV.NRCA.HHE. ML:1.0 0.000060700000000000005 0.14 AML other m 2020-08-25T10:07:35.18
IV.NRCA.HHN. ML:1.0 0.0000615 0.12 AML other m 2020-08-25T10:07:35.17
IV.TERO.HHN. ML:0.8 0.00003235000000000001 1.08 AML other m 2020-08-25T10:07:35.99
IV.TERO.HHE. ML:0.8 0.0000356 0.3 AML other m 2020-08-25T10:07:36.17
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