Secular Variations of Inclination of the Geomagnetic Field in SE Poland Between 1200 and 1800 AD

Jerzy Nawrocki; Karol Standzikowski; Maria Łanczont; Tomasz Werner; Jan Gancarski; Zdzisław Gil

doi:10.2478/geochr-2020-0031

Figures & Tables

(a) Location of sites selected for archeomagnetic studies in SE Poland and listed in Table 1. (b) Drilling of bricks in the ruins of Discalced Carmelites monastery at Zagórz (locality no. 22).

(a) Changes of magnetic susceptibility during heating and cooling at 20–700 °C range observed in selected brick samples from historical buildings of SE Poland (MPK1 – Krosno, defensive wall; KM2 – Krosno, defensive wall near Franciscan monastery; ZAG2 – Zagórz, Discalced Carmelites monastery; HA – Haczów, mansion). (b) Day plot (Day et al., 1977) for the same brick samples. Hysteresis parameters: Mrs/Ms versus Hcr/Hc rations for single-domain (SD), pseudo-single domain (PSD) and multi-domain (MD) grains, indicated by broken lines (SD/MD and SD/superpara-magnetic (SP) grains) are shown after Dunlop (2002).

Results of the AMS studies of 44 brick samples presented as equal area projection of AMS principal axes and relationships between the AMS parameters T (shape parameter), Pj (corrected anisotropy factor), and Km (volume magnetic susceptibility). The mean values of L (lineation), F (foliation), P (anisotropy factor), Pj, and T are listed in the table.

Results of thermal demagnetization of representative brick samples from SE Poland (demagnetization paths, intensity decay curves and orthogonal plots). SKD3C – Sandomierz, Dominican monastery; NKF1A – Nowy Korczyn, Franciscan monastery; BIE3A – Biecz, church Corpus Christi; BIS3B – Biecz, defensive wall; BK2A – Brzozów, church; LZ-1D – Leżajsk, basilica.

Two inclination curves at the Rzeszów reference site presented with grey belt of 95% confidence of polynomial of 8th degree fitting. The lower curve was calculated without data obtained from sites 10, 11, and 12 (see text and Table 1). The age and inclination errors for the data from each archeomagnetic site are presented by bars.

The regional curves of secular variations of inclination between 1200 and 1800 AD for Rzeszów (a), Gdańsk (b), after Czyszek and Czyszek (1987), and for five other regions of Europe (c), after Schneep (2008) and Pavón-Carrasco et al. (2009).

The regional curves of secular variations of inclination between 1200 and 1800 AD for SE Poland (this study), Austria (Schneep et al., 2015), and Bulgaria (Kovacheva et al., 2014).

Brick buildings in SE Poland and characteristic inclinations of geomagnetic field isolated from them and recalculated for the city of Rzeszów geographic coordinates_

Nr	Site, brick building	Geographic coordinates		Age	N	n	I	sd/α₉₅
1	Sandomierz, Dominican monastery	50.6765	21.7443	1235 ± 5	3	9	63.1	5.2
2	Nowy Korczyn, Franciscan monastery	50.2978	20.8056	1255 ± 5	2	4	64.5	5.1
3	Lublin, Dominican monastery	51.2478	22.5699	1342 ± 5	1	4	55.0	1.6
4	Krosno, defensive wall in Subcarpathian Museum	49.6956	21.7637	1350 ± 10	1	10	58.8	4.2
5	Krosno, town hall	49.6940	21.7649	1360 ± 10	1	8	60.7	1.7
6	Krosno, Franciscan monastery	49.6937	21.7667	1425 ± 10	4	5	67.2	2.1
7	Biecz, defensive wall	49.7311	21.2474	1430 ± 10	2	4	65.0	2.3
8	Biecz, church Corpus Christi	49.7306	21.2473	1460 ± 20	3	9	64.3	1.5
9	Krosno, defensive wall near Franciscan monastery	49.6832	21.7670	1490 ± 10	3	25	67.1	1.2
10	Krosno, Mayor's tenement house	49.6936	21.7659	1510 ± 10	4	4	62.2	6.4
11	Lesko, castle	49.4695	22.3254	1520 ± 10	4	11	62.6	6.1
12	Krosno, tenement house, Rynek 14	49.6935	21.7643	1560 ± 10	2	4	62.8	1.2
13	Baranów Sandomierski, castle	50.5018	21.5355	1570 ± 10	3	12	71.1	9.8
14	Jaśliska, town hall	49.4410	21.8028	1580 ± 20	2	6	67.8	0.9
15	Bolestraszyce, chapel	49.8168	22.8595	1600 ± 15	1	4	72.5	1.6
16	Leżajsk, basilica	50.2705	22.4077	1610 ± 10	3	12	68.0	1.7
17	Krosno, belfry of parish church	49.6944	21.7641	1635 ± 10	4	5	71.2	6.6
18	Dukla, palace (basements)	49.5568	21.6849	1640 ± 10	3	28	68.7	0.5
19	Leżajsk, defensive wall	50.2701	22.4089	1642 ± 5	1	3	66.9	1.2
20	Krościenko Wyżne, mansion ruins	49.6810	21.8076	1650 ± 10	3	6	68.7	5.5
21	Brzozów, church	49.6951	22.0189	1670 ± 10	2	8	66.0	9.9
22	Zagórz, Discalced Carmelites monastery	49.5007	22.2720	1710 ± 5	4	14	69.5	3.8
23	Stara Wieś, Jesuit monastery	49.7136	22.0139	1740 ± 10	2	6	72.8	2.6
24	Łańcut, castle	50.0681	22.2347	1772 ± 5	4	16	70.7	5.4
25	Dukla, customs chamber	49.5540	21.6842	1780 ± 10	2	18	62.9	1.6
26	Wzdów, palace	49.6430	22.0011	1790 ± 5	3	9	59.2	9.8

Secular Variations of Inclination of the Geomagnetic Field in SE Poland Between 1200 and 1800 AD

Figures & Tables

Fig 1

Fig 2

Fig 3

Fig 4

Fig 5

Fig 6

Fig 7

Brick buildings in SE Poland and characteristic inclinations of geomagnetic field isolated from them and recalculated for the city of Rzeszów geographic coordinates_

Paradigm

My account