Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-01-2021 and time 18:00:28 (UTC) in region 2 km E Urbisaglia (MC)

A magnitude ML 1.7 earthquake occured in region: 2 km E Urbisaglia (MC), on

  • 23-01-2021 18:00:28 (UTC)
  • 23-01-2021 19:00:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2, 13.4 at 23 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
Urbisaglia MC 2 2628 2628
Loro Piceno MC 4 2401 5029
Colmurano MC 5 1263 6292
Petriolo MC 6 1998 8290
Ripe San Ginesio MC 7 852 9142
Mogliano MC 7 4696 13838
Massa Fermana FM 8 963 14801
Pollenza MC 9 6618 21419
Tolentino MC 9 20069 41488
Montappone FM 9 1682 43170
Corridonia MC 11 15430 58600
Monte Vidon Corrado FM 11 731 59331
Sant'Angelo in Pontano MC 11 1436 60767
Francavilla d'Ete FM 12 964 61731
Falerone FM 12 3337 65068
San Ginesio MC 12 3498 68566
Macerata MC 12 42473 111039
Camporotondo di Fiastrone MC 13 563 111602
Belforte del Chienti MC 14 1886 113488
Montegiorgio FM 14 6851 120339
Treia MC 14 9403 129742
Monte San Pietrangeli FM 15 2458 132200
Cessapalombo MC 15 512 132712
Servigliano FM 15 2336 135048
Gualdo MC 16 815 135863
Caldarola MC 16 1823 137686
Penna San Giovanni MC 16 1108 138794
Rapagnano FM 16 2145 140939
Monte San Giusto MC 17 8191 149130
Belmonte Piceno FM 17 646 149776
Magliano di Tenna FM 17 1452 151228
Serrapetrona MC 17 966 152194
Torre San Patrizio FM 17 2048 154242
San Severino Marche MC 18 12726 166968
Montecassiano MC 19 7125 174093
Appignano MC 19 4213 178306
Monte San Martino MC 19 765 179071
Grottazzolina FM 19 3398 182469
Montegranaro FM 19 12990 195459
Morrovalle MC 20 10195 205654
Monsampietro Morico FM 20 659 206313
Sarnano MC 20 3264 209577
Monteleone di Fermo FM 20 395 209972

Municipalities with at least 50000 inhabitants

An earthquake occurred to
47 Km S of Ancona (100861 inhabitants)
63 Km E of Foligno (57155 inhabitants)
65 Km NW of Teramo (54892 inhabitants)
78 Km SE of Fano (60888 inhabitants)
83 Km E of Perugia (166134 inhabitants)
88 Km SE of Pesaro (94582 inhabitants)
94 Km NE of Terni (111501 inhabitants)
94 Km N of L'Aquila (69753 inhabitants)
98 Km NW of Montesilvano (53738 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.7 2021-01-23
18:00:28		 43.2 13.4 23 2021-01-23
18:10:21		 Sala Sismica INGV-Roma 86504691
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 18:00:28 ± 0.25
Latitude 43.20 ± 0.01
Longitude 13.40 ± 0.01
Depth (km) 23 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86504691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1124
Semi-minor axis of confidence ellipse (meter) 844
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 353
Circular confidence region, given by single value of horizontal uncertainty (meter) 1120
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 240
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.56208
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 86504691
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-23 18:10:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NRCA.HHZ. 2021-01-23T18:00:44.41 0.1 undecidable manual S 210 0.4218 109 0.12 93
IV.GAVE.EHZ. 2021-01-23T18:00:41.15 3.0 positive manual P -0.21 0
IV.ASSB.HHZ. 2021-01-23T18:00:40.40 0.1 undecidable manual P 254 0.5621 104 0.34 87
IV.FDMO.HHZ. 2021-01-23T18:00:40.45 0.1 undecidable manual S 234 0.2797 120 -0.01 99
IV.MNTT.EHZ. 2021-01-23T18:00:38.92 0.1 undecidable manual S 134 0.1996 130 0.42 91
IV.MF5.EHZ. 2021-01-23T18:00:38.83 0.1 undecidable manual S 168 0.2176 128 -0.08 100
IV.NRCA.HHZ. 2021-01-23T18:00:37.63 0.3 negative manual P 210 0.4218 109 -0.11 71
IV.CSP1.EHZ. 2021-01-23T18:00:37.94 0.1 undecidable manual S 232 0.1781 134 -0.09 100
IV.FDMO.HHZ. 2021-01-23T18:00:35.49 1.0 negative manual P 234 0.2797 120 -0.04 25
IV.MNTT.EHZ. 2021-01-23T18:00:34.38 0.1 negative manual P 134 0.1996 130 -0.02 100
IV.MF5.EHZ. 2021-01-23T18:00:34.51 0.6 undecidable manual P 168 0.2176 128 -0.12 49
IV.CSP1.EHZ. 2021-01-23T18:00:33.95 0.1 undecidable manual P 232 0.1781 134 -0.18 98
IV.MNTP.HNZ. 2021-01-23T18:00:32.72 0.3 negative manual P 141 0.0818 156 -0.45 71
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MNTT.EHE. ML:2.6 0.0018572515 0.1664 AML other m 2021-01-23T18:00:40.08
IV.MNTT.EHN. ML:2.2 0.000775 0.18 AML other m 2021-01-23T18:00:40.09
IV.GAVE.EHE. ML:2.2 0.0002785 1.04 AML other m 2021-01-23T18:00:44.74
IV.GAVE.EHN. ML:2.1 0.00019675 1.08 AML other m 2021-01-23T18:00:44.19
IV.NRCA.HHN. ML:1.5 8.68E-5 0.12 AML other m 2021-01-23T18:00:45.44
IV.NRCA.HHE. ML:1.6 0.00011135 0.42 AML other m 2021-01-23T18:00:46.56
IV.CSP1.EHE. ML:1.7 0.0002721997 2.2656 AML other m 2021-01-23T18:00:39.07
IV.CSP1.EHN. ML:1.6 0.0002216733 2.2912 AML other m 2021-01-23T18:00:38.16
IV.FDMO.HHN. ML:1.3 7.6975275E-5 1.8688 AML other m 2021-01-23T18:00:41.62
IV.NRCA.HNE. ML:1.8 0.00017229355 1.5488 AML other m 2021-01-23T18:00:45.93
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download