Why are Tang tombs rarely found in Jiaodong?

After reading "The Records of Dengzhou Prefecture", I have some thoughts. In the section of Dengzhou County Records, there are records from Jin Dynasty to Northern Wei Dynasty, that is, early frost and locust plague. There are three records in the Tang Dynasty, two of which are locusts and one is hail. Four articles in the Song Dynasty were all droughts, and three articles in the Jin Dynasty were all floods, droughts and locusts. On the 13th of the Yuan Dynasty, there was a flood, drought and locust disaster. There were more than 100 in Ming dynasty, including floods, droughts and locusts.

From the Western Han Dynasty to the post-Wei Dynasty, there are ten records in the section "Committing crimes in Shangjun", most of which are exotic things, such as "White Deer in the Original Present" and "Mulianli". Among them, the Post-Wei recorded that "the mountain was trapped in February of the nineteenth year of Taihe", which was the first record of the Jiaodong earthquake. There is only one record in the Sui Dynasty that "Donglai epidemic killed many people in eight years". There are two stories in the Tang Dynasty, "The dragon was assassinated in Donglai for three years, and a white deer was offered", and "After three years of opening, the Buddha statue of King Kong appeared in Wendeng". There are three articles in the Song Dynasty, the second of which records that "the Qixia earthquake in Li Qing for six years destroyed mountains, which naturally caused repeated earthquakes and there was thunder on the seabed. In September, 3,000 giant trees surfaced in Dengzhou, especially when JD.COM boarded in October. There were three articles in the Yuan Dynasty, the second of which recorded that "Zheng Zhi's four-year February earthquake in Shandong was like thunder". Since Yongle in the Ming Dynasty, every title has been recorded, and there are more than 50 titles, among which earthquakes were recorded in Yongle, Orthodox, Jiajing, Qin Long, Wanli, Apocalypse and Chongzhen, and earthquakes mostly occurred in Wendeng, Qixia and Laiyang, and there were also records of bombing people in Yongle.

From the above records, we can sum up a characteristic, that is, there were few records before the Yuan Dynasty, but the number of records suddenly increased after the Ming Dynasty. This feature at least explains the following two points: first, Jiaodong is located in the border area, and the central government has weak control over it in history; Second, before the Yuan Dynasty, the land was vast and sparsely populated, which also caused the weak control to some extent. Therefore, it is located in remote ancient times, with sparse population and blocked information. After Hongwu, the central government transferred more than 60,000 soldiers to the border of Jiaodong and settled in Jiaodong. Some western immigrants gradually crossed Jiaolai Valley and settled in Jiaodong, which greatly increased the population resources of Jiaodong, and the information gradually became smooth, and the ability to record information was naturally strengthened.

Historically, Jiaodong was an earthquake-prone area. According to records: "On the 23rd day of the first month of the sixth year of Yongle in Ming Dynasty, the Dengzhou earthquake thundered and ended in December. A small earthquake once in 50 years has been repeated from July 20th to March14th. In the eighth year, more than 6,000 people died in Ninghai County of Dengzhou due to the epidemic. " This record shows that an earthquake occurred in Dengzhou for one year and three months, which is really unheard of. Although the concept of time of the 6-year earthquake in Li Qing recorded above is not very clear, it shows that continuous earthquakes take a long time, and the earthquakes seem to occur at the bottom of the sea, with great power. Even the mountains collapsed, and the losses caused by the earthquake can be imagined. The above two consecutive earthquakes were separated by 250 years. In the Qing Dynasty, there were records of great earthquakes during the reign of Emperor Qianlong and Emperor Kangxi Daoguang, both of which lasted for more than a month. So, is it possible to have such a continuous earthquake before the Song Dynasty? It's possible, but it's not recorded. People often say that "there will be a great plague after a great earthquake", and earthquakes are always associated with plagues. The population decline caused by this earthquake is more serious than that caused by the war, and the locust plague caused by floods and droughts is even more serious than that caused by the earthquake.

This kind of continuous earthquake is irregular in the concept of time. Some earthquakes occur frequently within a few years, while others rarely occur. Although there is no record of tsunami in historical records, the tsunami caused by the earthquake is extremely powerful. When the earthquake and floods, droughts and locusts occurred after the earthquake, people had to flee their homes, be displaced and look for a paradise for life. The year is peaceful, the weather is good, and the people want it. Therefore, before the Yuan Dynasty, the population concentration in Jiaodong was wave-like, but after the Ming Dynasty, it showed a straight upward trend. No important tombs of the Tang Dynasty were found in Jiaodong, mainly because people fled their homes due to earthquakes, floods and locusts.