Earthquake with magnitude of ML 0.5 on date 20-01-2022 and time 03:35:21 (Italy) in region 2 km S Pornassio (IM)

A magnitude ML 0.5 earthquake occured in region: 2 km S Pornassio (IM), on

  • 20-01-2022 02:35:21 (UTC)
  • 20-01-2022 03:35:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0560, 7.8730 at 7 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Pornassio IM 2 685 685
Pieve di Teco IM 4 1338 2023
Rezzo IM 4 366 2389
Cosio d'Arroscia IM 4 221 2610
Montegrosso Pian Latte IM 5 118 2728
Armo IM 5 111 2839
Mendatica IM 6 185 3024
Vessalico IM 7 282 3306
Borghetto d'Arroscia IM 9 456 3762
Aurigo IM 9 347 4109
Caprauna CN 9 104 4213
Caravonica IM 10 282 4495
Cesio IM 10 283 4778
Briga Alta CN 10 39 4817
Carpasio IM 11 168 4985
Borgomaro IM 11 865 5850
Molini di Triora IM 11 617 6467
Ormea CN 11 1617 8084
Triora IM 11 355 8439
Aquila d'Arroscia IM 11 166 8605
Ranzo IM 11 557 9162
Alto CN 12 128 9290
Lucinasco IM 12 272 9562
Chiusavecchia IM 13 577 10139
Chiusanico IM 13 607 10746
Testico SV 14 196 10942
Nasino SV 14 207 11149
Montalto Ligure IM 14 377 11526
Casanova Lerrone SV 14 749 12275
Onzo SV 14 219 12494
Vasia IM 15 389 12883
Prelà IM 15 503 13386
Badalucco IM 16 1136 14522
Stellanello SV 16 808 15330
Vendone SV 16 388 15718
Pontedassio IM 17 2323 18041
Castelbianco SV 17 330 18371
Ortovero SV 18 1586 19957
Dolcedo IM 18 1415 21372
Garlenda SV 18 1254 22626
Diano Arentino IM 18 722 23348
Pietrabruna IM 19 501 23849
Arnasco SV 19 645 24494

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km N of Sanremo (54807 inhabitants)
46 Km SE of Cuneo (56081 inhabitants)
56 Km SW of Savona (61345 inhabitants)
93 Km W of Genova (586655 inhabitants)
98 Km S of Asti (76202 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.5 2022-01-20
02:35:21
44.0562 7.8733 7 2022-01-20
02:43:10
Sala Sismica INGV-Roma 99959531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-01-20 02:35:21 ± 0.27
Latitude 44.0562 ± 0.0108
Longitude 7.8733 ± 0.0113
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 99959531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1248
Semi-minor axis of confidence ellipse (meter) 435
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 329
Circular confidence region, given by single value of horizontal uncertainty (meter) 1250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.04856
Epicentral distance of station farthest from the epicenter (degree) 0.36962
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:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 99959531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-01-20 02:43:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.BURY.HHZ. 2022-01-20T02:35:32.01 1.0 undecidable manual P 220 0.3561 100 2.32 7
GU.ENR.HHZ. 2022-01-20T02:35:31.42 1.0 undecidable manual P 298 0.3696 50 1.46 14
FR.SAOF.HHE.00 2022-01-20T02:35:30.33 0.3 undecidable manual S 253 0.2410 104 -0.89 57
GU.CANO.HHZ. 2022-01-20T02:35:28.19 0.1 undecidable manual P 60 0.3013 101 -0.31 92
GU.IMI.HHZ. 2022-01-20T02:35:27.67 0.3 undecidable manual S 174 0.1466 113 -0.09 74
FR.SAOF.HHE.00 2022-01-20T02:35:27.08 0.3 undecidable manual P 253 0.2410 104 -0.1 73
GU.RORO.HHZ. 2022-01-20T02:35:27.68 0.3 undecidable manual S 68 0.1502 112 -0.21 72
GU.GBOS.HHZ. 2022-01-20T02:35:26.03 0.1 undecidable manual P 353 0.1871 108 0 100
GU.RORO.HHZ. 2022-01-20T02:35:25.45 0.1 undecidable manual P 68 0.1502 112 0.19 97
GU.IMI.HHZ. 2022-01-20T02:35:25.49 1.0 undecidable manual P 174 0.1466 113 0.31 24
GU.MGRO.HHZ. 2022-01-20T02:35:24.83 0.3 undecidable manual S 254 0.0486 141 0.17 74
GU.MGRO.HHZ. 2022-01-20T02:35:23.75 0.1 undecidable manual P 254 0.0486 141 0.36 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.MGRO.HHE. ML:0.0 0.00040229809999999997 0.1184 AML other m 2022-01-20T02:35:25.15
GU.MGRO.HHN. ML:0.0 0.00042800990000000006 0.1008 AML other m 2022-01-20T02:35:25.19
GU.MGRO.HNE. ML:0.0 0.00034650595 0.12 AML other m 2022-01-20T02:35:25.16
GU.MGRO.HNN. ML:0.0 0.00039188219999999993 0.1008 AML other m 2022-01-20T02:35:25.14
GU.RORO.HHN. ML:0.6 0.000036528950000000005 0.08 AML other m 2022-01-20T02:35:28.56
GU.IMI.HHE. ML:0.4 0.000026621497 0.0592 AML other m 2022-01-20T02:35:27.83
GU.IMI.HHN. ML:0.3 0.000021069320499999998 0.12 AML other m 2022-01-20T02:35:27.98
GU.GBOS.HHE. ML:0.1 0.000011153979500000001 0.2 AML other m 2022-01-20T02:35:29.23
GU.GBOS.HHN. ML:0.5 0.000023432075 1.04 AML other m 2022-01-20T02:35:31.90
GU.CANO.HHN. ML:0.7 0.000021748715000000002 0.2192 AML other m 2022-01-20T02:35:33.41
GU.ENR.HHN. ML:0.6 0.000016816305 0.0608 AML other m 2022-01-20T02:35:36.72
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download